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Two websites I was managing have suddenly gotten a 0 PR. They used to have a PR of 5 earlier.
I did not create any doorway pages or cloaking of text, or indulge in any other practices that Google frowns upon.
These sites still have a decent link popularity with Google (more than 100 links). I can't figure out what could cause the PR to slide down to 0 all of a sudden.
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What is your position in the results of a search for your keywords? If it is good just forget about the toolbar and the PR it returns, as it is unreliable right now.
Even if your position has dropped substantially it is too early to panic, as it seems that some areas of Google are currently in a very unstable condition, fluctuating constantly.
My oldest site has gone from a PR 3/2 to a PR 1. Despite this, I *finally* rank in the top 100 for my key search term - #1, in fact. :) And several pages of my personal site rank in the top 5 for relevant terms, despite being only PR 1. My conclusion? Either PR isn't showing correctly, or PR isn't worth what it used to be.
My site is strange, because it's a free web-based email site that has a puppy theme to it. So I don't know if it's because we have both types of content on the page... free email, and pet stuff.
Likewise, we have links from free email sites and pet related sites likewise... and of course, all of those people that post by our free-email to some sort of discussion list that archives on the web, and newsgroups, we get links from those as well.
I guess that's the flaw of Google PR. It assumes that you only have 1 major topic, and it assumes that everybody links to you the same way.