I was there on the 8th and there were lots of not generic - be non-Disney type costumes. The most popular... families of pirates, they were all over the place. My friend owns a costume shop in Orlando and we saw the same ladybug (adult female) costume he sells 3 times. Also saw some other "sexy" costumes on women: witches, pirates, nurses, bumble bees. Lots of the little ones had the Disney costumes, but I know it's harder to find good grown-up ones. No offense, but on their site most of them are quite cheesy.
Jan '07 Pop Century, Mar '07 Day Trip, April '07 Off Property, May '07 OKW, July '07 POR, Oct '07 Pop Century (& MNSSHP!!!), Dec '07 Day Trip
Jan '08 POR
Feb '08 Pop
Mar '08 Off Property
April '08 AS Sports - I think - still gotta book it