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I just checked Jack Dongarra's site (on a tip from Boing Boing).

BlueGene(L) takes the lead, with an Rmax of 70720 GFlops. It's followed by Project Columbia, at 51870 GFlops. Earth Simulator is third, with 35860 GFlops. Several clusters are benched at ~20GFlops. It looks like a site needs at least 10 GFlops to enter the top 10-- and it's even possible that Virgina Tech's System X will be knocked out of contention, if a couple of surprise entries publish benchmarks before the Nov 09 top500 list.