A few months ago I stumbled upon what came to be one of the most interesting Swing blogs I’ve ever read. Actually, it is the most interesting Swing blog I know of. Exploding Pixels, by Ken Orr, shows how to create beautiful looking Swing applications for Mac OS X.
Ken has a great sense of design, pays great attention to details and his examples are really well written. Even if you do not work with Mac OS X, you’ll find a lot of valuable information on his blog, in particular how a UI developer should deal with details and pixel-perfect designs. I highly recommend you read all of Ken’s posts right now :)