Bxflow, most places (80-95%) where you can put a link are no-follow.
They do carry weight and sometime more.

If you still think nofolow won't help, tell that to my blogs that rank on first page only with no-follow links, or to my blogs that have few no-follow links from wikipedia and rank on first page as well.


What I think it is more important than no-follow, is the relevance of the link.

Cheers