Research Participation Opportunities at http://etsu.sona-systems.com/

APA
Features a help center along with news of events, publications, and resources for professionals and the public.  

APS
Organization of over 40,000 physicists worldwide offers memberships, access to research journals, and physics Internet resources. 

Psi Chi National
Members of this psychology honor society can compete for scholarships, attend conventions, and participate in public service. 

Society for Neuroscience
Excellent resource of society events, publications, groups, and membership details, with links to many further resources. 

Classics in the History of Psychology
By Chris Green, Editor, this site has original material by some of the biggest names in psychology and philosophy.

Psychology Online Resource Central
Lots of stuff here, from info on grad schools, to potential careers, and everything else psych.

Undergraduate Publication Outlets - Publish Your Work!

» The Undergraduate Journal of Psychology

» Psi Chi Journal

» UCLA Undergraduate Psychology Journal

» Journal of Psychological Inquiry

» URC Undergraduate Research Journal