Midori - a lightweight Webkit-based browser - lands on Windows
It's important to note that Midori is still in the alpha stage - recently hitting 0.1.10 on Linux and the Windows binaries now on 0.1.8. If you're after absolute stability, Midori might not be your thing. I experienced the occasional crash while playing with the interface, though it was plenty stable while surfing and utilizing web apps.
So what else can Midori do? Apart from the expected features like tabbed browsing, and bookmark and history management it's got support for Userscripts, Userstyles, the Netscape plugin architecture, and extensions. Search options can be customized as well and you can assign a token (i.e. preface with g to search with google).