Midori is a lightweight WebKit-based browser.
The program's big button interface and straightforward settings mean it's very easy to use. And of course you also get core features like tabs, a configurable search gadget, user styles, cookie management and extensions for the most needed features such as ad blocking, form completion and mouse gestures.
There are plenty of extras, too: spell-checking, RSS/ Atom/ XML feed detection, an ad blocker, kiosk mode, customisable user agent and more.
Sounds great, in theory. In practice, it's not so reliable, at least for the Windows build we tried: the program crashed each and every time we tried to launch it on our first test machine. We had more luck on the second, but that wasn't exactly encouraging.
If you're looking for a WebKit browser which just works, then, opting for Chrome would make more sense. But when you get Midori working it's a likeable tool, easy to use but with some interesting features, and if you're exploring the alternative browser world then we'd give it a try.