Google comments - pagerank and me

So if Google hasn't indexed me directly, how come the Google toolbar claims the PageRank of my weblog is 4/10?  It can't show me a cached copy of my page, or any backward links ....

A little later ... I believe what I'm seeing is differences between different parts of Google's network. A little while ago I did a search on Google, and got my web page .. I did it again a while later, and didn't. My guess: the databases with the web page matches are updated on a rotating schedule, but the pagerank information is centralized.