Internet Chem Lab
I know that some of you are interested in chemistry, physics, and other sciences - well, even if you are not, I've recently came across something really cool: the internet chem lab http://chem.engr.utc.edu/
It is an actual laboratorium at UTC, and with the internet GUI you could conduct actual real experiments - not simulations! Granted, the experiments are fairly basic, but it is still a cool place - if you register, some experiments could be viewed in real time via a webcam.
Sometimes the wait time is fairly long (~15mins) because the faculty and students at UTC have priority.