Watanabe's new project Inquisitor has both style and use. It wraps up a pretty interface
in a very useful piece of software. It has perhaps the best interface I've seen to search
in a long time. There's also a very pretty Safari plugin for it that wraps up the interface,
and like most of those sorts of things allows a bit of customization too. I've been using
it for about a week now and it has quickly become one of my favorite extensions for
any piece of software.
A quick plug on one of David's other projects: NewsFire. A good OS X application that
I've been using for a while now and it's quite nice.
http://www.inquisitorx.com -- Inquisitor
http://www.inquisitorx.com/beta -- Inquisitor Web Interface
http://newsfirerss.com -- NewsFire
Edit: re-edited to help the layout. Blogger Beta is painful