my site also iwebtool predicts it to go pr5 lol and now it's 0 http://www.google.se/ and google.co.uk for example is also 0 lol
youtube.com at pr 3 also has to be a glitch. i have three sites that i feel have to be glitches at pr n/a ... i can't figure out why they would have gone down from 4, 3, & 2 (respectively) to pr n/a ... all are totally white hat sites. anyway these obvious glitches with youtube and google give me some hope that perhaps my pr n/a are glitches too. as i've mentioned before i don't think PR is particular important unless you are a link seller but it'd still be a bit of a bummer to have a pr n/a for no reason.
Jez, ultimately I agree with you. I make my living from SERPS not from PR. And I'll trade all my PR for good SERPS any time But it's still nice to see some green when your checking out your sites.
Checkout Technorati's PR = 6, it was 8 an hour ago; Keep adding to this, it's hilarious seeing Google mistakes