The second profession in the series of my profession-centric WoW Gold Rushes, Blacksmithing! I wanted to avoid being like "Um, belt buckles and PvP gear" so it was fun to go back and look through my profession list.
I had no idea what I was going to do until after I started recording. This just goes to show that one of the best things you can do to learn to make gold with a profession is just sit down at the AH and look at it. Gold guides, blog posts, and spreadsheets are all well and good, but don't forget you can usually turn a great profit by just checking the territory out for yourself!
(Haha, I love that you can totally see my bank toon sitting AFK in front of me while I'm browsing the AH.)