I don't think that is it. I do not have amazon feeds on my main pages. Yes I have them on subpages in another directory, BUT The only page to take a real hit was my index page.
Now my home page/ index page, does have AP Wire RSS feeds for news, but I am using RSS feeds on other pages that still have their G PR (unlike my home page)
What I think happened to my index page was that G decided to get rid of it due to the number of and quality of non-relative links it had on it.
For Ex. there were/are 80+ links on the home page that forced G to crawl my PPC search results database. i.e. this is a typical PPC site with "popular searhes" listed on the home page. G should be coming back around any day now, and if this page does not improve I think I'll have to history those "popular search" links...