I noticed something today about Zamus's grab: It can grab out of the air. There is the obvious stun to grab combo, which works whether your opponent is grounded or not, but I've noticed some other things that are nice, too, such as dtilt --> grab, or uair --> grab. Note, of course, that these combos aren't necessarily guaranteed, due to the massively reduced hitstun in Brawl, but they're good against slow learners, and the latter one, at least, seems to work well on Bowser.