Glenn,
255 is, or at least
was, the maximum score a page could receive. If a page hit that score the entire site would get banned. I was told that a site could only be re-included upon a manual review. Before hitting 255 a site could increase its rankings by adjusting the on page factors.
Jim
Disclaimer: This information was provided to me at SES San Jose 2006. Things
might have changed since then.
