To save you searching the web for useful sites relating to your particular field of study, librarians and subject experts have produced subject gateways (often called portals) which link you to, and describe, quality websites in all subject areas .  Here are a few you might find useful:

 Pinakes provides links to a number of excellent subject gateways
            

Check out our own Subject Portal pages - your Subject Librarian has selected quality sites of interest too.