I bet the conspiracy theorists and complainers that ran to another pool are kicking themselves now, especially since the hashrate fell by about 10% and our payouts went up.
Alas, they'll be back, refreshed and ready to carry on with their daft accusations next time we have a big dip in the luck.

The drops and then rises in hast rate are surreal. Statistically there is no benefit on 'pool hopping'. No matter what 'luck' exists anywhere. All very random, there must be more tin foil helmet wearing peeps out there that I ever imagined.

Statistically, there
is a benefit to pool-hopping at Slush's pool.
http://organofcorti.blogspot.com.au/2012/08/42-slushs-score-method-and-miner.htmlKudos, and point taken. Just not sure that for my 100Gh/s such a statistically small, and tortuous to explain benefit is really worn it.
Another one for the big boys to do, I guess. Though still, knowing when to 'hop' in and out is the element of 'luck' which is still intangible.
Nonetheless, informative!

Thanks you.
However ... "Though still, knowing when to 'hop' in and out is the element of 'luck' which is still intangible"
No, otherwise pool-hopping wouldn't work. I didn't publish it in the post, but I wrote an empirical function which determines when you should stop submitting shares. It depends on the pool hashrate, the current mining difficulty, and th constant "c" in Slush's reward algorithm.
and will data centres with multi terrahash capacity use this to maximise there gain? .............. ...............?
Anyone can. When I mined and tried the strategy, I'd get around 5 to 10% more than expected, consistently. You don't need to have a large hashrate to do this, just automated software that tells your miner when to leave and mine else where.