I'm gonna have to agree with the others who claim that PhotoPost creates duplicate content issues. At least 90% of the pages from my website that are in the supplemental index are photopost pages. I'm talking thousands of PP pages in supplemental from my site.
Today I started doing some modifying which will include modifying the way PP does meta description and keyword tags, adding robot meta tags, some redirects, and a few other things.
Just an example of what the problem is. Go to: http://www.google.com/search?q=site:...or+the+huck%22
and then click on "In order to show you the most relevant results, we have omitted some entries very similar to the 4 already displayed.
If you like, you can repeat the search with the omitted results included."
12 of those 13 results are supplemental and of the EXACT SAME PHOTO PAGE. Google IS NOT merely disregarding duplicates and regarding one single page as the 'correct one' and putting that into the regular index. They're ALL going into supplemental.
Sure there is subtle functionality gained with all those variations in the URLs but that functionality isn't even user-friendly. As a user myself I find it frustrating when I'm at a photo page and the navigation for next/previous photos changes depending on how I got to that page.