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Just wondering. My site has Pr0 but everyone keeps saying PR is messed up right now so not to worry. And I don't think I've done anything to justify a penalty. Nevertheless, if it stays 0 for too much longer I'm going to start worrying... ;)
If your site is really penalize because you are spamming. Then you need to wait AT least 1 updates if you clean up the 'dirt'.
It helps to email webmaster AT google.com and tell them you have clean up your site and ask for reinclusion.
But again, everything is in early stage and you should wait until the update complete before you do anything. My 2 cents.