Okay, I mentioned making a ost about how to get yourself gold before Cataclysm, because we all know all the new training, mounts and extra stuff you want are gonna cost GOLD! The only transferrable commodity from Wrath to Cata.
Now the first things for making gold you can look at is Emblems of Frost and Emblems of Triumph which are earnt through the lvl 80 dungeon finders. These can be exchanged for the tradable items like Crusaders Orbs, various Gems, as well as Primordial Saronite which can only be obtained with the rarer Frost Emblems.
Gems can also be obtained by either participating in Battlegrounds for Honor, or alternatively, running level 80 Dungeons while you have control of the Wintergrasp PVP zone, which will earn you Stone Keeper Shards, which can also be traded for honor at the Wintergrasp Vendor.
The Gems can then be simply bought at the PVP vendors in you factions Major capital city, either Orgrimmar or Stormwind.
If you'd rather earn money through using your professions, most gathered materials at high levels fetch a good price, especially through mining ore such as Eternium or Saronite.
I'll continue with Professions in another post, but for the moment, anyone trying to make money before Cata should give it a go!