I'm posting this entry with Google's new browser, Chrome - in beta of course. First thoughts: economical and very speedy.
You can read more about why these things are so here.
I like it so far... quite a bit. You can download it yourself and try it out.
If you take the time to read the 38-page storyboarded / comic panel description of the app at the first link, you'll understand why I think this is the most significant change in computing in a decade. This browser is, in my opinion, a replacement for Windows. It runs like an OS.