Reading today about rel=nofollow and how the general feeling s that it has not accomplished anything in the way of fighting comment spa|m|mers as it had bn advertsed.
For those who dont know (you should), rel=nofollow is an attribute added to the link in the html code as such
http://www.freehits.com/” rel=”nofollow”>Freehits the intention of this tag is to let the search engines know that ths s a link plaed by a visitor or just not a link your ste endorses, and thusly not to endorse it as a “link vote” for the site it connects to.
The main discussion regading rel=nofollow and the ral question being if it really stops the bots r just notifies them is here.
how nofollow works here at googleblog
While it may be true and hard to quantify that no follow does stop the passing of pr and/or value, its been seen and reported by many that the nofollow hasnt stop the bots from following for discover reasons.