Firefox. I use Chrome sometimes for moderating a forum I'm a member of (to keep the two id's more distinct) but even though it is light and fast I don't really like the look or layout.
Perhaps it's just because I've put a fair amount of effort into tweaking my FF but I have very few complaints about it and love some of the features. I've even managed to pare the display down so I'm happy with it on my netbook.
The Google aspect also keeps me from totally embracing Chrome. I have these times when I imagine waking up and finding that Google and Amazon control the entire world.
