Simon Willison’s Weblog

Fading Out Nofollows? Philipp Lenssen suggests automatically removing the nofollow from links in comments a few days after they have been posted, to allow administrators time to delete spam without penalising legitimate authors. 15th April 2007, 8:27 pm

Wikipedia nofollows links. Wikipedia’s high PageRank means this is likely to have a noticable knock-on effect on the rankings of many other sites. 22nd January 2007, 7:27 pm