Oven Bits has got a clean design with a great use of jQuery. You can tell a lot of extra detail and care was put into the site (hover over the baked goods in the footer).
Solid Giant is a great example of mascot usage. Mascots draw visitors into a site on a deeper level and provide a sense of continuity.
I've always been a huge fan of MetaLab because of their super slick interfaces. Their style is reminiscent of iOS's UI, but they add in enough subtle differences to make it feel different.
Cornerd has got a really fun, cartoony theme to it as well as smart usage of a single page jQuery-enhanced layout.
Sites for iPhone apps/app developers always seem to be well-designed and SoftFacade is no exception. Also, take a look at the icons, amazing stuff.