There are really 3 ways to increase your internal page PR's:
1. Links from external sites - directed to those pages.
2. Internal links (carefully structured).
3. Increase your home page PR.
Golden Rule: Get other websites to link (to the most relevant pages on your site) using targetted anchor texts... this helps both PR (all pages) and serps (the ultimate goal).
Links direct to your internal pages will help their PR the most, (but will also increase the PR of your entire site).The PR of the linking pages is of least importance (assuming they are indexed/cached by Google) relevance is much more important.You can compensate for "lack of PR" by getting more links - also allowing you plenty of opportunity to vary your anchor texts and "attack" more KW's.Internal link structure is probably THE most important thing.
If you have 1,000 links on your home page, your PR4 will be so evenly divided that each page will probably end up with almost 0 PR benefit.
If however you only link from your home page to your category pages, say you have 20 categories - you could possibly achieve PR2/3 on each of those.
If each of those links to 50 products, you might well achieve PR1 on many of those pages... (don't take my figures as "gospel", just think about the principles).
A "breadcrumb trail" will also help with both PR structure AND keyword relevance.
Note that - increasing you home page PR will also result in more PR passed to your inner pages.
Don't be afraid to link out to other (good quality & related) websites from your inner pages; the (teeny) detrimental effect to your PR will be easily offset by the increased relevance / trust for your site (and it's resulting improvement in your serps performance).
http://forums.seochat.com/showpost.php?p=389631&postcount=6
