Originally Posted by
MrkGrismer
In addition to all of the above very good suggestions I have one more to add:
Kill things faster. Dead things don't give you negative levels.
It is not really an option on some content (Ghosts of Perdition...) but you get neg levels back now relatively quickly many things that give neg levels won't neg you if you can kill them fast enough. Beholders especially, on a monk you should be able to take them down very quickly (consider maldroit handwraps of bone breaking, if you can find them).
Oh, and grind tangleroot for Flesh Rendor Visors ;)