Well Arsenal have a fairly easy group with the only real threat IMO is Alkmaar.
Bordeaux will have a helluva time getting outta group A with Juve and Bayern but hopefully Bayern slip up, which I think they might(with there shaky defence).
Hopefully Wolfsburg can get outta Group B first seeing as they seem to be the obvious team that can beat Utd, not saying they will but I hope they do.
And the big ones:
Barca - Inter
Ac Milan - Real Madrid