http://www.freetech4teachers.com/ - This site is altered daily. It is a massive collections of technology resources and reviews with a focus on classroom application.
http://animoto.com/ - An easy and fast way to turn photos into videos. Music can be added to increase the effect.
http://voicethread.com/ - An ingenious tool where multiple folks can comment (using video, voice, or a drawing tool) on a paper, photo, or video. Very cool site for getting kids to work together. Robin used this to have her kids study for a quiz by having each student solve one problem and then comment on the solutions that other students gave.
http://www.snagfilms.com/ - I can use this in a class when I need to watch a movie and I don't have it available to me. This site has loads of free movies - lots of national Geographic specials.
http://www.teachers.ash.org.au/jeather/maths/dictionary.html - Math dictionary with excellent pictures and explanations.
http://www.sacmeq.org/statplanet/StatPlanet.html - World map with lots of statistical data shown in a visual way. I want to investigate this more to see if it could be used with Fathom.
http://stat.cmu.edu/DASL/ - Collections of statistical data. Great for use with Fathom.
http://khanacademy.org/ - A large collection of videos for math and science.
http://www.mangahigh.com/ - A site full of various math games that are pretty good graphics and I think the kids would like them. Moves very fast, but that's probably a good thing.
http://www.zamzar.com/ - A site to convert u-tube videos to windows media video or other files. Especially useful if my school blocks u-tube content.
http://www.delicious.com - A site to hold all of you bookmarks! Invaluable!
http://wordle.net - I used this to create math vocabulary poster and graphics.