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I agree PCInk that there's probably not much to worry about if you're still looking good in the SERPS. My home page went to PR0 a month or so ago and it hasn't affected my traffic at all - actually, my traffic has increased.
Only panic if the internal pages start becoming PR0.
I've got a few (out of several thousand) internal pages that have gone to PR0 also. But I'm not worried yet.