I missed this a few days ago, so just in case others missed it, too, and you're worried about a PR drop, here's what Google's Adam Lansik had to say (Adam works with Matt Cutts):
Quote:
If you've seen your PR adjusted to a non-zero number OR you've lost significant traffic, this thread does not really apply to you.
If, however, your PR has dropped to zero AND you've not seen any significant loss in traffic from Google, rest assured that this is most likely a PR-reporting (PR on Toolbar) error; while admittedly alarming at first site, it's nothing to worry about. The tail does not wag the dog in these circumstances 
With that said, I'll be chatting with some colleagues again today to hash out what might be occurring, and I'll report back here with any news.
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