Did you know that Wikipedia already implemented the rel="nofollow" attribute on all their external links? What do you think about it? Maybe spammers will stop inserting spam links on Wikipedia pages...

weblog.cemper.com has some good thoughts about this initiative, defined by the NONOFOLLOW-group:

12 Reasons against nofollow:

1. nofollow does not prevent comment spam
2. nofollow is semantically incorrect
3. nofollow harms the connections between web sites
4. nofollow is not useful for humans, just for search engines using PageRank or similar a technique
5. nofollow could be used to shut web sites out
6. nofollow discriminates legitimate users as spammers
7. nofollow heists commentators' earned attention
8. nofollow will not stop comment spam
9. nofollow could be used to further discriminate weblogs
10. nofollow prevents the Web from being a web
11. nofollow eliminates the dissemination of free speech
12. nofollow was developed in privacy with only search engines companies taking part in the discussion

PR Weaver supports the No-NoFollow group :-)