PR Sculpting is the process of optimizing the linking structure within a website for the purpose of achieving the highest possible PR (Google Pagerank). The primary technique used for PR sculpting is the utilization of the “nofollow” tag within links.
According to Google, their search engine robot does not crawl links with the nofollow attribute which means they don’t pass PR juice. So, you would think that by “nofollowing” the crap out of all your external links, that you would be able to retain the full potential of the PR on your site, right? Wrong. This may have been the case before, but Google now handles “nofollow” tags differently. Here’s an illustration for all you visual folks:
So, does PR Sculpting work? Probably not. Worry about what is more important – content and inbound links.