Luck hopping

Hello,
I started mining a couple of days and since it is always more fun to do things in groups I joined slush's pool.

Now I could observe that whenever the Luck goes up the cluster performance goes up to. So I guess there are people watching the pools luck and joining the pool that is most lucky. In fact I don't think that they physical are watching the luck but rather that a script is choosing the pool with the best luck for the next block.

I would be interested which scripts are used for luck hopping and if it really increases the reward. I mean, just because the pool had good luck the last couple of hours does not mean that the next block will also be solved that fast - otherwise it would not be called luck,....

So yeah basically I am interested in luck hopping scripts and the percental more gain you can get from hopping.

Cheers,
Chris