SEARCHMASTER – A great page for all kinds of searches.
GRAMMER AND PUNCUATION
PEOPLE AND LOCATIONS
DICTIONARIES AND GLOSSARIES
General – www.onelook.com
General – http://itools.com/
General – http://www.refdesk.com/
Legal – http://www.lectlaw.com/def.htm
Real Estate – http://www.realestateabc.com/glossary/
If you know of any other links that I’ve missed that you think will be helpful to others, please feel free to add them in the comment box.