Page Rank. What is going on?

Today I have checked out one my sites and it now has a 0 PR from google. I thought this was strange as it had a strong PR4 site that was ever increasing.

I check all my other sites and the same has happened to them too they are now also a PR 0 and it seems that everysite I visit they no longer have a PR anymore (including this site)

Does any body now what happened? Or have a link that shows what happened as it is a bit worrying now that I have spent a lot of time and a bit of money to raise the awareness of my site to help increase the PR and SERP and now it seems to of gone to waste.
 

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