I'll agree to disagree about Gambon.  It took a bit to get Harris out of my vision, who was perfect as the warm and fuzzy wizard, but I think Gambon is fine (and a fine actor, too).  He brings a gravitas to Dumbledore that is really needed at this time when things are darkest.
I'm really looking forward to seeing/hearing more of Rickman as Snape in this film.  All my Rickman festishing aside, he's another terrific actor and how I wish he'd do some reading (books on CD/download), he just makes me melt. 
