I, personally, would argue against this form of
SEO, Kinembe. First of all, pagerank is overrated, imo, and your efforts might better be used trying to form relationships through mutual links with appropriate websites.
These links will improve your serps, a much better outcome than just having a good
pr.
The search engines came after the link farms hard and heavy and now I'm waiting for the other shoe to drop...
They seem to have a lot of shoes up there so I'm not sure which one will be hitting us.