App of the week: WebKit

"WebKit is an open source web browser engine. WebKit is also the name of the Mac OS X system framework version of the engine that's used by Safari, Dashboard, Mail, and many other OS X applications."

The WebKit guys do nightly builds of the engine. I've been using WebKit 3 Build 30368, and it's screaming fast compared to Safari 3.0.4, and definitely much much faster than FireFox. Do try this out. 

[works only with Safari 3 installed. Works on Windows with a little hack.]

http://webkit.org/