BetterWhoIs -Find out who owns any domain.
DevSearch -The developers search engine. 
DotCom Directory -From Network Solutions
eZines Db -Online pubs, e-zines, journals, newsletters.
Forum One -Search a quarter million web forums, BBs, etc..
Google Groups -Search newsgroups.
Great Domains -Domain broker. 
The List -The definitive list of ISPs.
NCSA -Tips. 
NetSearcher -"Reviewed, credible, and reliable."
Newsletter Access -Searchable directory of over 5,000 newsletters.
Tile.Net -Discussion lists, newsgroups, FTP sites.
W3C -World Wide Web Consortium.