There's a thread going about this here.
The Sam Adams glasses seem popular, I'd like to try them some time. It seems that most people are happy to drink most of their beers, session-style, from a standard pint glass (or variations, more fluted ones, etc) or a mug; for serious tasting, or barleywines, or Belgians, they'll often go for a tulip glass, brandy snifter, various curvy goblets, that do better at giving you the aroma and maintaining the head. There are a lot of neat pics in the thread I linked.
One thing that is generally not recommended is putting the mugs in the freezer. It kills head retention, and to me it just makes things too too cold to taste.