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Unique contents and lots of backlinks with enough link juice is one of the best ways to get higher page rank.
Backlinks with link juice can be made using link wheels and article submissions!
I agree with the info above. As long as you have a lot of -good- backlinks and unique content that's updated regularly, you're sure to get your pagerank improved. Heck, I wasn't exactly webmaster savvy when I started out my sites, and I managed to get them at PR4 without knowing what I was doing.