I wrote a post last June dealing with expanding your keyword list, and the kind folks at Trellian wrote to let me know about KeywordDiscovery, another keyword discovery tool. I have been using the service for a month now and can report good things.
KeywordDiscovery gets keyword data from nearly 200 different search engines worldwide and aggregates them in a database that you can search. It’s a useful tool for discovering new keywords that are related to ones you are currently bidding on or optimizing your site for.
