Car Stuff
Oldsmobile Only - This is a site I am working on for my step dad. It will have a ton of information on 64-72 Oldsmobiles, but if you've ever tried to build or maintain a web page you know it takes time.
Tesla Motors - I want one!
Science and Engineering Stuff
Java Applets - This guy wrote some really good interactive applets to help visualize some of the most abstract topics in the field of physics. Even the obscure topics like quantum mechanics.
Java Applets II - Here's some others, they're not as good though
All About Circuits - This is an online book that is very practical in it's investigation of electricity and electric circuits.