As far as I've seen, no enchantment [mind-affecting] spells, powers, whatever, will hit a PM. Chill touch will cause fear, although fearsome armor will not. PWS will stop us
Dancing will not. Enthrall still lands (such a pain!).
If you absolutely, positively need to stop a Pale Master, try Halt Undead. It's like hypnotism for dead people.
(Also, we're not immune to blindness)
Edit:
PvP is awesome.
As regards warforged...it's just so entertaining to watch them running around failing all their saves and trying to fix themselves up.
And then before you know it, ding! Toast's done!
And clerics...well, I don't fight clerics. >_>;;