We have three in use (our bedroom, the computer room/bird room, and the guest b.rm), but there is a room downstairs that used to be finished (bsmt. bdrm.). It hasn't been used in years, and is more or less being used for storage now, so I really wouldn't call it 'finished' anymore...Someday, though, we are going to re-do it.
Also, we plan on knocking out the wall between our b.rm and the computer room to make our room bigger....Less rooms, but our room will be *much* nicer!