Web Design from Scratch
This is a nice site for web developers. It has a ton of fairly light-weight articles on various aspects of web design.
The author has started a project to write a book called “50 Redesigns from Scratch” which will be published in print and as a free (but less featureful) PDF version. The first couple of redesigns have been posted as previews.
I always love “before and after” design examples!