apparently google wont give PR jice to nofollowed links, but i have yet to see proof of this. i may do some experiments and see. a guy once got PR5 DP profile from a nofollow link on his PR6 site.
They have the same advantage as robots.txt. If you want certain things out of the search engines, use them. Same goal, different means. For example, if you have the same content in different parts of your site (e.g. in both a blog and a feed), you don't want the feed indexed--Google punishes duplicate content. So use robots or nofollow to keep the feed out.
No, nofollow tags may be more helpful in eliminating excess OBLs and yet, nofollows are not bad at all.
Google does support the "nofollow" tag. It does block the PR bleed off of the OBL. I am testing this now. All "nofollow" links that had PR within my site went to "gray bars" (timeframe: july 12, 2007). I am using them on all OBLs now. But will remove them from any internal links. Wiki is now using them on all OBLs within their site.
The advantages are channeling Pagerank or Authority within your site, ie Nofollowing links to printer friendly page versions or RSS pages so the authority doesn't get passed on to them but rather stays with the original version. Also for blog comments etc so you don't pass weight to sites that may be banned etc. There's advantages when used correctly.
The main advantage of using nofollow tag is-- your PR juice won't be passed to the site that you are linking to.
I would hope this to be true but where did you come to this conclusion? I just hate posts that make a claim with no backup.
I must agree with the point. what no-follow does is it instructs to the search engine like Google that your Pr should not influece the PR of the site you are linking to. regards