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There is a lot of research documents on PageRank, my advise would be to check out the SEM research Topics forum here at WebmasterWorld, were a lot of them have been discussed.
And my tip is to focus less on PageRank and more on content, and conversions and getting good inbound links with a good anchor text.
A good start is:
Successful Site in 12 Months with Google Alone [webmasterworld.com]