Last summer, during the San Jose SES conference, Trellian announced a keyword research tool at Priority Submit, it now goes under the name of Keyword Discover.com. Many keyword research specialists, including Dan Thies.
Recently, Trellian announced a Keyword Discovery API. I am sure you crazy coders and search enthusiasts will love this flexibility. Personally, I am thinking up ideas on how I can use this to provide fun and useful tools for the community. Forum discussion on this topic at High Rankings.