Google Chrome is Google's open source browser project. As rumored before under the name of "Google Browser", this will be based on the existing rendering engine Webkit. Furthermore, it will include Google's Gears project.
Apparently, it also includes its own JavaScript VM to help speed up scripts. Sounds interesting. I wonder how it'll render CSS ;) Seen as it's based on Webkit, I'm guessing it'll be very very good.
In other news, I also came across a FF extension called Pixel Perfect (well, actually it's a Firebug extension). It allows you to overlay an image onto a website, so you can see how close the coded site is to the original designs. Quite handy if you do that sort of thing.
Update There's a load of screenshots now available.
You can read the comic if you want. It describes some of the features.
Due to be released tomorrow, so I'll be giving it a go then.