I am doing some research into additional keyword research tools and thought I would include a few here...
First up is Rapid Keyword!
Keyword Brainstorming Tools:
Built-in Overture Keyword Suggestion tool
Meta Tag Parser, finds already carefully researched keywords in web pages
Find potential keywords on hundreds of relevant webpages
Powerful typo generator based on 7 different typo formulas
Quickly find out how many ads are running on Adwords for your keywords
Research Competition on Overture and FindWhat
Know how popular your keywords are
Manage Keywords Lists:
Merge and Split- Eliminate duplicates
Quickly Wrap your keywords for desired match type
Combine word lists for possible keywords
Filter out keywords that contain undesired words
Remove a list of keywords from your master keyword list
Rapid Keyword! offer a free trial version
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Find profitable keywords, analyze competition on pay-per-click engines, manage your keyword lists. Download a Free Trial now.