g1smd - 1:28 pm on Jun 14, 2006 (gmt 0)

Every page that I have ever cleaned up the code on, has risen at least a little within a few days to weeks.

I would also suggest running Xenu LinkSleuth over you site and checking for consistency of linking and anchor text format, and so on. Look carefully at the error list and the reports, and then scan your eye over the generated HTML sitemap for other obvious problems too.