I happened to come across some excellent vintage posts from Guy Kawasaki on how to name your start-up.

Here are the links:

Articles:

How To Name A Name:
http://blog.guykawasaki.com/2007/11/how-to-name-a-n.html

The Name Game:
http://blog.guykawasaki.com/2006/02/the_name_game.html

What's My Name:
http://www.halfagain.com/general-marketing/whats-my-name.html

Trademark Tips For Your Web App:
http://blog.guykawasaki.com/2006/08/trademark_tips_.html

Pros And Cons:
http://blog.guykawasaki.com/2007/02/a_study_of_the_.html

Tools:

More Words:
http://www.morewords.com/

Word Lab Tools:
http://www.wordlab.com/tools/t_index.cfm

Dictionary.com
http://dictionary.reference.com/