Midori is a webkit based browser that I've been using. It's fast and lightweight.
It works great, including with Flash via swfdec, but it does crash when using Gmail.
The browser is undergoing very active development. I've been doing git pull each morning and running it out of the build directory to get all the shiny new bugs^Wfeatures.
$ sudo apt-get build-dep midori $ cd ~/src $ git clone git://git.xfce.org/kalikiana/midori $ cd midori $ ./configure && make $ cd _build_/default/midori $ ./midori