Have a mint
I first came across the website of Shaun Inman from one of the CSS design galleries, where his site was reviewed after a recent redesign. In the last day or so he just released his new going-solo application Mint, whose whole design I simply adore.
Unfortunately the demonstration site is getting hammered and as such he has had to disable it (gosh, don't we wish we could all say the same about our sites!?). In lieu of the demo he has posted a screen-cast movie (which was taken at a very high resolution, so you may have to squint a little) of him showing the application in action.