One e-commerce site I run went from PR0 to PR3. A majority of the categories also increased in PR, though most product pages still sit at zero.
A musicians fansite I run has stayed stable at PR4. It's the only website dedicated to the musician online, has hundreds of pages of content, comes up number 1 in a Google.com search for that artists name.... yet Google still rank its importance at 4. For the subject matter it should be given a 10, it caters to every visitors needs perfectly even if I do say so myself
None of my sites have dropped in PR, but I'm a good boy and follow Googles guidelines 
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