Jakob Nielsen is considered the guru of web usability. He writes a bi-weekly column called Alertbox: Jakob Nielsen’s Newsletter on Web Usability. There is definitely some good reading.
His Amazon.com biography, in case you do not know his background…
Jakob Nielsen, Ph.D. is a principal of Nielsen Norman Group. He is the founder of the “discount usability engineering” movement, which emphasizes fast and efficient methods for improving the quality of user interfaces. Nielsen was noted as “the world’s leading expert on Web usability” by U.S. News and World Report and “the next best thing to a true time machine” by USA Today. Nielsen’s Alertbox column on Web usability has been published on the Internet since 1995 and currently has about 200,000 readers. From 1994 to 1998, Nielsen was a Sun Microsystems Distinguished Engineer. His previous affiliations include Bell Communications Research, the Technical University of Denmark, and the IBM User Interface Institute. See his biography page at useit.com for additional biographical information.