http://www.kindlemap.net is the very best Kindle map website I have seen. You can see maps, travel directions for cars, bikes and walking and Google street view, all on your Kindle screen. I will certainly come back to this site again, and again, and again! Also check out its links page, full of more Kindle ready mapping sites!

http://m.vpike.com is made by the same people as http://www.kindlemap.net. It works well with Kindle 3 - don't know if it does work with earlier versions. I prefer the older version, so it it doesn't don't worry. It does have a nice feature than you can look at the major tourist buildings and where they are on a map without going there. It lets you visit many metropolitan areas without leaving your home. View interesting places, your past and present homes, and much more.

http://www.kinstant.com/calculator is a super simple to use calculator. Has the numbers 1-9, and the 4 operations, (+, -, x, /). Nice to know you have it for when you need to quickly add things.

https://www.dropbox.com/m/login is a free service that lets you bring your photos, docs, and videos anywhere and share them easily. Never email yourself a file again!

http://nowsci.com/grss-web will let you can use the browser to read your Google Reader feeds directly with 'G:RSS-Web'. I tried it out, and it works. It let me read my RSS feeds in a nice format on the Kindle.

http://www.goodreads.com/mobile lets you see what your friends are reading. Keep track of what you've read and organize your books into virtual bookshelves. Join a book club to discuss your thoughts in more details. In addition, you can type in the name of a book or an author and get an unbiased review of the book. A really nice site.

http://www.librarything.com/m catalogs your books online, easily, quickly and for free. A similar idea to http://www.goodreads.com/mobile but the opening screen is very bare - you need to join to see if it for you, while the other site had lots I could do without needing to sign up.

http://www.readingthenet.com makes reading the Net Fast & easy web surfing for the Kindle 3. Enter URL or search terms.

http://www.instapaper.com/m is the mobile version of http://www.instapaper.com/. Instapaper is a tool to save pages for reading later on your Kindle. It is a very hit-and-miss website, as it does remove all the rubbish and make a website Kindle friendly, so great for graphic heavy websites which take forever to load, but when I put this site's full URL (it needs the 'http://' part to work) into it, it also stripped away all my navigation buttons in the process. I am sure some will like it but it is still not better than http://www.readingthenet.com.

http://www.skweezer.com lets you view all of your favorite Web sites and blogs quickly and easily on any Kindle device. I must admit, between this and the readingtheweb.com option above, I did prefer readingtheweb as it was much easier to see and read on a Kindle.

http://www.kinstant.com links you to dozens of the best websites, specially formatted for the Kindle's web. They offer a feature which many people will like - you type in the address of your graphics heavy desktop website and boom - they convert it into an instantly useable Kindle friendly website. You do lose lot of the nice layout however, but I guess this is the price you must pay if you really need to see a desktop site on a Kindle.

https://jottit.com makes getting a website as easy as filling out a textbox. For a quick look at what Jottit can do, check out the great screencast tour of Jottit. It was quick and easy to use and lets you make a simple Wiki of an idea, which can be shared with any other Kindle or other computer user to add and change. I really liked it.

http://pen.io is the fastest way to way to publish online. period. Lets you write and share your ideas online, so friends can edit your masterpieces. Great for shared writing tasks in class.

http://wrttn.me is a simple notepad with a large number of features.Make your note, save it and share it with friends. Very easy and fast, isn't it? It looked clean and simple.

http://www.google.com/pda is a great way to use google, as it makes all the results far easier to read than by using the normal Google.com search.

http://www.google.com/reader lets you read your favourite RSS feeds in one place with Google Reader, where keeping up with your favorite websites is as easy as checking your email.

http://m.google.com gives you the whole Google suite for mobile phones. Not all of it works, but the fun is exploring and seeing how much you can use. I have used the maps, blogger and gmail successfully from this link on a Kindle.

http://m.ask.com is the mobile version of the Ask search directory. This is a great place to get directions to somewhere.

http://m.bing.com is the mobile version of the Bing search directory. I am really big fan of this site, especially the mapping service.

http://mobile.twitter.com has got a great new look, and has some great features. Check it out today!

http://www.kintweet.com/login.php is a Twitter client that has been designed for easy access on the Amazon Kindle.

http://kindletwit.com is kinder, gentler (somewhat French) Twitter client that happens to work well on your e-reader device.

http://m.comcast.net lets you check the weather, play games, send an email and look at the news all in one place.

http://webonyourcell.com offer a surprisingly short organized list of links that are low bandwidth and made to work well on your Kindle.

http://m.wolframalpha.com's long-term goal is to make all systematic knowledge immediately computable and accessible to everyone.

http://en.m.wikipedia.org is the mobile version of Wikipediea, and much easy to read than the desktop version.

http://www.amazon.com/mobile is the mobile version of Amazon.com and much easy to read than the desktop version. However does not for some reason allow digital downloads!

http://www.amazon.co.uk/mobile is the mobile version of Amazon.co.uk and much easy to read than the desktop version. However does not for some reason allow digital downloads!

http://m.yahoo.com is the mobile version of Yahoo, and much easy to read than the desktop version. I was even able to access my email from here (which I could not do on the Kindle on the desktop version for some unknown reason!)

http://m.gmail.com will take you to your online gmail account. To register for a gmail account, you will need to first have a text sent to your mobile phone, then after that, you can open it with a Kindle.

http://m.comcast.net/m/ is your mobile destination for Comcast email, TV listings, and more.

https://login.live.com to access familiar services like Hotmail and Messenger from your Kindle. The writing was small, until the auto-zoom kicked in then it looked fine.

http://mobile.srh.noaa.gov is the mobile version of the weather forecast for anywhere in America.

http://mobile.srh.weather.gov/ (NWS Southern Region) is apparently your best source for complete weather forecast and weather related information on the web!

http://m.wund.com gives you the weather forecast for anywhere in the world.

http://www.m.ca.gov gives you the weather forecast for California, plus travel and road details.

http://www.mobile.jobserve.com to search around 24,724 live jobs in UK, Europe, Middle East, Africa & Russia.

http://m.discovery.com/ (Discovery Channel) to keep up to date with the latest in science.

http://mbible.com and you will have an easy to read online bible on your Kindle, ready for any unexpected event!

http://m.youversion.com gives you a bible reading course for lots of different situations.

http://m.wikihow.com tells you how to do anything from remembering people's names to nursing a pregnant rabbit.

http://www.poets.org/m/search.php offers great poems to teach poetry events. Simple search function on the site, to cover most occasions.

http://mobile.brainyquote.com offers great quotes so you look like you are well read, and up with the greatest works of literature. This is an extensive collection of quotations by famous authors, celebrities, and newsmakers.

http://wapreview.mobi has a long list of other interesting reference sites you can use on the Kindle, which I would really recommend you check out.