We only update the PageRank displayed in Google Toolbar a few times a year; this is our respectful hint for you to worry less about PageRank, which is just one of over 200 signals that can affect how your site is crawled, indexed and ranked.

Amazingly, I've discovered that some people with a dangerous level of knowledge about the Internet (just enough to get into trouble, not enough to realise how little they know) can obsess about Page Rank.

Google says: "worry less about Page Rank". So there you go.