Just so people are aware, jagger is updating the visual PR (ie: what you see in your Google toolbar when you visit a site). The real PR is updated behind the scenes on an on-going basis. At the point Google does an update, that’s the only time your PR score can be considered accurate. As soon as you start acquiring more links, you PR will change, but you won’t know what it is until the next update.
As an aside, PR is more of a novelty item. It is important for attracting link partners, but in the end it doesn’t do much for your SERPS if you don’t have a solid linking strategy.