ichthyous - 10:15 pm on Jul 9, 2008 (gmt 0)

I made a big mistake last year and nofollowed quite a few of my internal pages...it really hurt my site when the PR of those pages vanished. I removed all of them except for contact us and search pages and everything returned to normal within two weeks or so. I would use nofollow tags very sparingly and only on things that really don't have any inbound links or pass much PR to other portions of your site.