I usually leave LittleSnapper running in the background, and take a screenshot when I come across a design that I like, so my LS library is usually where I go first. The collection is pretty eclectic, so it would be tough to categorize to a specific blog / website / designer. The most recent entry is of the Versions website (www.versionsapp.com) - like Sam, I'm partial to many indie Mac software designs.

I also tend to browse Ffffound.com on a frequent basis.