I’m glad the WordPress community took such a strong stand against them in themes. Countless blogs could have been penalized just for the theme they were using, not related to anything they did or did not do on their blog.
Ahmed disputes that point on his blog, and has some decent evidence to back it up. Is Matt spreading more of Google’s fear, uncertainty and doubt to his advantage, or are sponsored themes something to worry about when it comes to PageRank updates?
My own opinion on all this is mixed, but check out Tech Soapbox for more on the mater.