So, i havent seen this here before.
Bottom scanner is an Addition to THe auctioneer addon (available only at the Auctioneer addon site).
Anyways, if you dont use auctioneer addon, its a great tool for Making money in the AH.
Bottom scanner looks for things that you can A. re-sell well
B. Dischant for more money than the Item is worth
C. Sell to a vendor for more $$ than the person is selling it for!
You must have a fairly recent and ever updating Auctioneer, but is well worth it.
I have made over 100g (im an enchanter) and i started with 15. hehe. Its quite easy to use, and makes a pretty profit.
Sorry if this was posted b4, but i searched and didnt find anything.
Good luck and happy hunting!