Build HIGH PR backlinks of your website, blog posting and commenting will also help you to increase your website PR in very short time.
First of all you posted in wrong SECTION Secondly PR is just a number nothing more stop wasting time/resources with it Concentrate on RANKINGS PR and RANKINGS are 2 diffrent things
Unique content and high page ranked backlinks are the influencing factors to get good rank. So keep optimizing your site and build more quality backlinks.