So I use the Chrome browser and have done ever since it came out. It has a clean interface, it's beautifully simple to use and it's as fast as they claim; on those occasions when I open Firefox - for the "what does this look like in other browsers" test - I find myself drumming my fingers waiting for it to load.
I particularly like the Gmail desktop notifications that Google now support for their browser. I might as well comment on the online music business as to Google's use of HTML5, but what it has impressed on me is that slow move away from applications running on a desktop operating system, to those running on the web. At home I've recently found myself closing Outlook and keeping the browser open - and of course that's what Microsoft is afraid of.