I'm thinking about doing some wacky jiggin for deep water smallies but I have a question or two?  Can I use any old jig head for this application?  What weight would you recommend for fishing 30' of water?

I would rather drop shot in 30 FOW.  I generally use wacky jigging in 5-15 FOW.  If you go to a heavier weight to get the bait down, you lose some of the appeal of the slow, waggling fall.

Like JF, I would think drop-shotting would be more effective in water that deep.

In fact you could just tie up a ds rig with a long leader and wacky rig a worm on it. Then you could get the bait down but still have that slow enticing fall of a wacky worm.

Ike calls this technique the "wet noodle rig"