http://www.emoticonize.com/
Ever tried adding a smiley for MSN? Then you know you will need this one! With this site you can turn any picture of your choice (max 150kb I think) into a proper MSN smiley, animated or not.
Some examples in spoiler
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http://vectormagic.com/home
Now this site is really useful, in more than one occation. Say you want to print a t-shirt and you have a picture, but it's really small and when you try to make it bigger it just looks like crap. This site is your answer to the problem! Pick any Bitmap image and make it look perfect.
An example of my own
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http://www.shirtmockup.com/
Check what your shirt may look like on this site.
http://www.tineye.com/
Do you have an image on your computer that would look awesome as a wallpaper but it's too small/big for your screens resolution? Upload it here and the site will automatically find every size of the picture available on the internet.
http://wallbase.net/
Continuing on the topic of wallpapers, this site has them all. Try searching for starcraft ;-)
http://www.tokbox.com
You and some friends have webcams and want to chat with them together? Use this site! It's simple to set up and simple to run. This is also perfect if you want to have sex online with multiple partners at the same time. (uh-oh I read it somewhere)
http://listen.grooveshark.com/
Ever heard of the swedish music-invention spotify? This one is almost better, you don't need to have it on the actual computer since it's all in the browser, one account for any computer.
That's all for now but be aware - Shean Plomme is coming.
Edit: Post your website finds here too please!!