I was going to write a longish blog entry, but Bryan blogged it quite well. It is in fact as awesome as he says. If you’re willing to run bleeding edge Firefox, you should try it.
The amazing thing to me is just how much ~800 lines of JavaScript and HTML code can totally change one’s computing experience. In terms of usefulness per lines of code, it’s the highest of any free software project I’ve written, not joking. With a bit more work, I think it could be strongly considered as the new default home page for Firefox.