my first question is why you want to increase pr.

and any way
that is all about link popularity so start linking

If you increase your Google (Quality) back link so definitely you get better result with your Google PR...

Page rank can be improved with quality of content and quality of backlink

Mainly Google believes in Quality content.
So try to do your Website's SEO with some quality backlinks.

try to get Backlink form the Google,this will provide you the best way to get PR

ever have a beneficial content. Hit the directories coz they are generally good spidered and are a great path to assist get your site in the engines rapidly.

As per my knowledge by getting good traffic or backlinks you can improve PR.
Quality backlinks helps to get good PR.

Well, there's very little importance left for PR now.
Rather then concentrating on increasing PR i will advice you to gather relevant backlinks for your website which will help you to improve traffic to your website.

quality links and good content are the best way to get high pr.

there are too many methods you can find on this forum, but all need times.

Originally Posted by Atcomaart

If you increase your Google (Quality) back link so definitely you get better result with your Google PR...

Absolutely right. By increasing Quality back links you can able to increase the PR of the site but for getting quality back links for anything do posting and commenting in the relevant theme based site.

link building is good idea but it needs time
have patience