Stringing 2 or more mini's together for a more powerful computer

has anyone cabled together more than one mini to make a more powerful computer? and how would this be done. was thinking about buying 3 or 4 of the low end mini's and putting them together. In fact, as I get money I can make my computer more powerful..
any thoughts on this?

hummm.. wonder how much they want for that..
was reading a while back how a university put 5000 mac servers together and made a super computer..
something like that on a smaller scale..
4, 5, or 6 minis...
thanks I will check out the Xgrid further..
I imagine it will require optical cabling between each unit?

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