from Frank Mullen

The Niche Database from Frank Mullen is a huge collection of under-exploited high traffic, low competition key words and phrases. It's already in a handy spreadsheet format that gives you information on number of searches, number of competing sites, number of times the phrase shows up in Wordtracker, and the number of Google Adwords campaigns for the key word or phrase. He also give you his "Keyword Effectiveness Rating", which gives you an idea of how hard it would be to achieve a top ranking in Google for that particular key word. Not only does he include monthly updates at no charge, he also shows you exactly how he compiled the database so that you can do the same kind of research on your own.   An invaluable resource !