Guess what, at least BTCguild + deepbit are definitely hoppable and slush probably too... once the "easy" small pools switch to porper payout structures these are next on the agenda for hoppers - 2 pools is better than 0, and you can earn a LOT on both - given the high hash rates there.

Delaying stats etc. is by the way NOT helping, just making it a bit more interesting to hop (and if you keep the code for yourself, they might even stay proportional longer, giving you a nice profit for longer times)