Yahoo! Search Marketing notified advertisers this afternoon of some pending updates to their manage bids page. From the email:

"In early December 2006, some of the information on the Manage Bids page will no longer be available. We will be removing the "Top 5 Max Bids," "Position" and "Your Cost" columns from the current account interface. The View Bids tool will also be removed."

Those fields will be replaced by 1) Estimated Average Position which displays an estimate of the average position a listing may achieve based on your bid and the current bids of other advertisers, and 2) the Bid Range for Top Positions which displays the current range of bids other advertisers are willing to pay for the positions at the top of the search results page.