Tricool # 3
OpenCourseWare - get access to material of all programs offered at MIT. Considering that you literally get world-renowned professors' notes, FREE, this is cool.
Thinkgeek - the place where you can buy (or just view i.e. 'windowshop') all sorts of handy and not-so-handy cool geeky gadgets.
Bored? If you are, this great site is just what you need. Go ahead, kill some time.