FieldTripEarth--free data, plus info from real, live research programs going on all over the world.
NESCent--the National Evolutionary Synthesis Center. More (lots more) free data, plus educational materials on cutting-edge evolution research. (I think when the speaker demonstrated this, half the room started drooling at the data that are available...)
EduWeb--a source for online/digital, educational games on science, technology, history, and art.
Dryad--another open access data depository.
PRI's The World Science--weekly science podcasts, news stories, etc.
Scitopia--a peer-reviewed-research search engine.
Fold.it--play computer games for SCIENCE!
Spot.us--donate to journalists needing funding to cover their stories.
Science for Citizens--find research projects looking for volunteers.
Pandemic II (game)--play the bad guy. Design germs, infect people, get points!
Science Cheerleaders--learn basic science facts, find citizen science projects, and take a brain makeover quiz!
9 years ago