ATM there are not many pools and some good hopping strategies.
If you want to read more about Pool Hopping itself please read: https://bitcointalk.org/index.php?topic=24966.0
beeeeer: is using PROP: very good hopping opportunity
just hop in as soon as their stats page shows a new block and leave as soon as 41% of the average shares per block has been found (CDF).
ypool: PPLNS 20 rounds. AFAIK not hoppable: could be used as a fallback
bytemaster: uses a PPLNS variant which is bound to a day. run a slow miner and watch their stats. as soon as their stats are lucky jump in, if they get unlucky get out.
as PTS have very short rounds atm it is not feasible to do this manually. if someone would set up a multipool for this (as all miners are available as source it shouldnt be too hard to develop a proxy for them) it would be possible though.
To all Pool OPS: PLEASE USE HOPPING PROOF REWARD SCHEMES! There are plenty!
Everytime i see a hoppable pool i HAVE TO THINK THAT THE POOL OP tries to CHEAT ME (because he could hop his own pool).