In case you hadn't heard as of yet, Yahoo discontinued the Overture keyword tool. It appears they want you to use their Site Explorer tools instead:
Yahoo Officially Discontinued The Overture Keyword Suggestion Tool
Focusing on Search Engine Marketing and the world of search engines including observations on search engine optimization, research, news and commentary. Search Innovation Marketing Blog is written by Daria Goetsch, founder and search engine marketing consultant for Search Innovation Marketing. Daria has been involved in search engine optimization since 1998. Visit http://www.searchinnovation.com
In case you hadn't heard as of yet, Yahoo discontinued the Overture keyword tool. It appears they want you to use their Site Explorer tools instead:
Yahoo Officially Discontinued The Overture Keyword Suggestion Tool