I think it would be helpful to list the username of the seller for the auction being sniped. I find myself bidding on several auctions from the same seller as they tend to carry items of a similar nature. In some cases, I'd like to only bid on items if I've won one (or close to winning) another one from the same seller. If I notice that several from a supplier are out of reach, maybe I won't bid on the others.

Anyhow, I think it would be helpful just to have it in the list and shouldn't take up much room.

Actually that information is available already. Just click on "view extended info" and you'll see the seller's id as well as up to the minute current bid levels, and the ending time of each auction.