Hot on the heels of episode 1, here is episode 2 of Interface Exposé, showing off the great addon Market Watcher.
Get Market Watcher (WoWInterface/Curse)
If you want to analyse Auction House data, Market Watcher is a great tool.
Click through to see some example charts!
Here is my chart proving my infamous Saronite price prediction:
Crusader Orbs were a terrible investment idea:
And finally, Titansteel Bars seem to suffer the same deflation that most WoW goods share: