Does anyone know any good research web sites? What about good reference sites for science--something easy to use with a search option? (Any discipline...)

http://www.webelements.com/webelements/scholar/index.html
http://www.answersingenesis.org/docs/1315.asp
http://www.ursa.fi/~mpi/earth/
http://www.curtin.edu.au/curtin/dept/phys-sci/gravity/index2.htm
That should hold you for a while.

The Biology Project
Understanding Addiction: Basic Science Information
(This site has a good overview of dopaminergic neurotransmission)
National Institutes of Health

This is a general reference site, but I always found Infoplease helpful for scientific information. Hope you find it helpful!