msafi - 5:18 pm on Apr 10, 2011 (gmt 0)
g1smd, Page 3, which is the default first page that the user sees, does not have its own URL. It shares the same URL with the "content" page. That is: http://example.com/foobar/ shows Page 3 of comments. Page 2 of comments is located at http://example.com/foo/comments-page-2/ and Page 1 of comments is at http://example.com/foo/comments-page-1/. Newer comments push older comments down.
There are no duplicate content issues here. Even if there were, I'd be able to handle it with rel="canonical" no problem. I also link to sitemap.xml from robots.txt to tell engines what the main pages are. I don't include comments pages there.
Thanks for your concern.
I'd really love some help with the formulas!