NIST - SI Units - Official NIST International System of Units, metric prefixes, and more...
UTeach Outreach Program - Take your science knowledge and help teach elementary school kids.
Sanger Learning Center - located over in Jester A332, a useful on-campus resource that you should utilize for all your classes for help.
University of Illinois : VSEPR! Really good site with javascript friendly 3D models.
The ChemWiki Project (UC Davis)
HyperPhysics - nice site on atomic theory
Entropy Sites - by Dr. Frank Lambert (Occidental College) Some VERY GOOD sites and revelations about entropy. Click on the LINKS menu item at the site.
A Student's Approach to the Second Law and Entropy
Electropaedia all sorts of info about energy supply and battery technologies, battery applications, chargers and ancillary equipment. There is even a very nice "History of Technology" section.