WowAce

When you search items through a list (Favorites) it could show the items of your list that are not actually in the auction house (now it just shows the items that are on sale in that moment).

For example when you select a list of favorites it could show the list of items that are on sale (with the actual format) and below the items that are not on sale showing in the price column something like "item not found".

It could be very useful for sellers when checking the actual prices of many items at the same time (instead of checking one by one).
(I looked for an addon that could do it but without success and since this is my favorite addon for auctionhouse I thought to suggest it to you).