I'll probably look into taking that in a few levels. I'm a TWF with my fists, and we're only at level two, so taking that at six probably wouldn't be the best idea unless i get some more powerful stuff first.
Forgot one: in Dragon #317, James Wyatt updated his Oriental Adventures book- the Shaman's Improved Unarm Strike gains the Monk's damage progression (but nothing else from that class).
There is the monk/rogue hybrid Ninja (complete adventurer) so yes the GM might be grumpy about the unarmored wisdom bonus and ther ki abilites likeness to a monk's but otherwise its one or two feats away from being a very nice unarmed master just an idea.