SEO Inbound links and pagerank

When considering how offpage characteristics effect your sites ability to rank well for given keyword terms It cannot be stressed enough that “Page rank is Page to Page, (NOT SITE TO SITE) and independent of URL designation”. What this means is that once your site enters into the PR system ie: indexed by Google by virtue of backlinks from and external source domain, then a link from an internal page with “X” amount of PR contributes exactly the same PR weight as a page from a different URL with “X” amount of PR weight to distribute (all other factors being equal).
Getting my link popularity started – what does it take?