My friend forget PR and focus on writing quality content. You can have a less than 10 links pointing to your site and still rank top in Google. Yahoo and MSN for popular keywords and phrases. It is not quanity, but quality of links.
I personally think that the PR indicator is just a way for Google to get more people to install their toolbar. It is basically there for entertainment purposes. A gimmick.
It is so simple to get your website ranked in the top 10 SERPs without having a high pagerank or none at all.
I have a website that have over 3000 different keywords and phrases in the top 10 ib Google SERPs.
Another website over 2000 keywords in the top 10.
I have two single digit keyword that is in the top 100 from 6.5 billion websites in Google SERPs.
Some of my websites have 10 backlinks and others 100+
Forget the green PR bar and focus on writing quality content. If I had the choice of Google PR bar or bar. I would rather go to the second bar and have a drink.