Google Chrome
Everybody is talking about this so I had to take a look.
http://www.google.com/chrome
This makes for my 3rd browser. I use Firefox by default, IE8 Beta 2 just because it works better with our intranet, and now Chrome to see if it is that good.
I saw the comics and I see the point of making a multi-process browser. Besides that I don't find any real reason to move away from Firefox, although it is increasingly crashing on my machine (but that's because of some add-ons I use).