Webster's Dictionary of Legal, Lawful and Propaganda Terms
www.Freedom-and-Law.org 

Lloyd Duhaime's WWLIA Legal Dictionary - wwlia.org/diction.htm

U.S. Patent and Trademark Office - www.uspto.gov

Hospital Web - neuro-www.mgh.harvard.edu/hospitalweb.shtml

Medscape - www.medscape.com

U.S. National Library of Medicine - www.nlm.nih.gov    

Bartlett's Familiar Quotations - www.columbia.edu/acis/bartleby/bartlett

RxList Internet Drug Index - rxlist.com

Nationwide yellow pages - BigYellow.com

Find anyone anywhere - Anywho.com

Catchall - Reference.com

Encyclopedia and Reference Resource - www.1upinfo.com

Not sure of a spelling?  Enter both versions and it finds the number of instances that each is used on the Web and shows you the most popular usage:
www.spellweb.com/dualwebber.php

Create an automatic "out of office" email reply - http://pubs.logicalexpressions.com/Pub0009/LPMArticle.asp?ID=127

Street drugs - www.StreetDrugs.com