Just saw this a few minutes ago. Freaking great idea. This is going to be badass when it gets out of alpha/beta. It's just a toy for now but this is going to simplify a lot of tasks in the very near future.
http://labs.mozilla.com/2008/08/introducing-ubiquity/
I know similar things were possible with yubnub or even quicksilver on mac but it's never been this polished.