I went to check on my dedicated WCG rigs, and I'm pleasantly surprised by what I saw:

Stuttgart, my 2GHz Pentium DC is somehow pulling nearly 950 PPD (Windows 7 x64)

Wurttemberg, a 2.8GHz C2D is pulling about 1150 PPD (Windows 7 x64). I would have actually suspected the PPD here to be higher, given that it's clocked nearly 50% higher than the PentDC (and is a Penryn-6M CPU vs a Penryn-1M)
Also, both systems have an uptime of around 2 weeks (16.5 days on W, 13.5 days on S)