I believe it was just last week when I used the Overture Keyword Bidding Tool, and today, it’s gone. It has alwasy been useful for SEM professionals to use this tool to check the current bids on a keyword to get a good estimate on how much a certain ad campaign may cost and gets you prepare to come up with a targetted budget. These used to be on:

http://uv.bidtool.overture.com/d/search/tools/bidtool/

or

http://uv.bidtool.overture.com/d/USm/search/tools/bidtool/

But today, both URLs will give you this message:

Gone
The requested resource
/d/search/tools/bidtool/
is no longer available on this server and there is no forwarding address. Please remove all references to this resource.
Apache/1.3.34 Server at astatine Port 8070

The HTTP status code on this is an Error 410. Unlike an Error 404 that tells you a page is missing, an Error 410 is really telling you the page was deliberately removed and no longer exist. Has the keyword bidding tool moved to a new URL? If yes, why not do a 301 instead? If not, I guess they are only making this available to current people with accounts on Yahoo Search Marketing and will just have the tool available to people with actual active campaigns.