Are you still using the Overture keyword suggestion tool? - yes! the tool for getting relevant keywords / phrases with their search counts. We have seen many flip-flops, ups and downs at this tool, sometimes it's working and mostly not.
Now, if you want to get keyword suggestion from this famous tool, then you would not get the actual thing on the site. You will be amazed to see Yahoo! Search engine marketing page instead of Overture Inventory. Yes! it's no more there on the site. It's been permanently redirected to http://sem.smallbusiness.yahoo.com/searchenginemarketing/