JS_Harris - 7:22 pm on Jul 22, 2009 (gmt 0)

I own a site that was heavily sculpted. I removed the nofollow attributes completely and watched the site plummet in the rankings, in replacing them the site returned to its former positioning.

If you have a site that already has nofollow sculpting i'd leave it alone. If you plan on sculpting on a new site I'd save my energy and work on other important aspects of a website instead.

My (limited) tests show a grandfathering effect, old sites seem to be affected by it whereas new sites don't.