I'm planning on signing up to a few pay per posts sites. SponsoredReviews PapyPerPost etc. Will doing these types of paid reviews damage the chances of my PR rising?
Nobody knows for sure if in the future it'll damage PR. But if you want to sell links like that go ahead - whats the problem if they take some PR from you? If you're not selling the links then the PR is absolutely worthless as it doesnt equate to traffic or anything else of value.
http://www.techcrunch.com/2007/11/16/payperpost-bloggers-get-slammed-by-google/ Something you might want to look into....