Merriam-Webster's online dictionary and Thesaurus:
The Author Network Resources for Writers:
http://www.author-network.com/
Author Pseudonyms:
http://www.trussel.com/books/pseudo.htm
Thesaurus, Phrases, and Quotations:
http://www.freeality.com/phrasest.htm
Helpful Sites for Writers:
http://www.geocities.com/Athens/Forum/6682/writing_sites.html
The Rejection Collection:
http://www.rejectioncollection.com/
Fantasy name generator:
http://www.flatearth.com/utilities/namegen.asp
Market survey sites:
http://www.ralan.com/
http://www.spicygreeniguana.com/
http://www.specficworld.com/
USPS postage calculator:
Writers Digest site: