That's a good idea!
I think I'd have to create a separate Google Reader a/c though ... my regular one is rather full of un-read stuff, and I'd have to be a little careful. In fact, Google Reader asked me only yesterday if I wanted to synchronise off line. When it said it had over 2,000 things to do, I declined the offer!
I could also use it as a way of testing Google Chrome, as that's meant to have really good Gears integration (as it should!)