If you're looking for some quick gold, do a scan of your Auction House (Auctioneer addon is what I use) and find the blue/rare gems from WOTLK content that's buyoutable for 4g or less. Cut these suckers and vendor them for 4g 50s each.
I personally make around 200g a day just by scanning+cutting while I'm going to the bathroom or such.
It's not gonna make you the richest player to ever walk the realm, but it's nifty if you're AFK anyway.
(Requesting deletion, I posted this in the wrong forum)