I would be interested in a page for flyertalkers like the current First class one that shows M, B, Y and other potentially upgradeable fares to various destinations.

Since DL took over NW and doubled or tripled these fares, an easy way to search for bargains on international travel would be most appreciated.

I suppose this gets complicated because some airlines allow you to upgrade ANY fare for a price (e.g. CO), but if you swing over to the DL and NW forums, you would feel our pain.