Google Chrome
3
Update: After using Chrome for a couple of weeks, my assessment is that it's not (quite) ready for prime time. Flash video players don't work very well with Chrome (sometimes they won't play), and despite the marketing material to the contrary, one locked tab will lock the whole browser. Plus, you can't add extensions. I'm back to Firefox 3.
Original Review: I've only been messing around with Google Chrome for a few hours, but so far so good. It seems very fast, and I think the fact that you can do google searches from the address bar is pretty neat. I also like that if one tab on your browser locks up, it doesn't bring down the whole browser. I'm not ready to move all my bookmarks and stuff over, but I'm thinking about it....