Stockpile mats for leveling blacksmithing, when this change goes through, a lot of people may switch, to get the sockets. At least that's the current wisdom on most of the blogs, and on WoW's forum.

There could be some good profits from this, for a little while. You may see gem prices go up a little, too- that everyone was a miner/JCer meant a glut of gems on the market.

Also, jewelry may get very pricey, too.

The other profession the flavor of the month crowd is talking about is tailoring.