Steve Krug, usability expert and author of Don't Make Me Think. His great advice about making websites intuitive can be applied in a much broader context.
Woot, a deal-a-day site with a great sense of humor. I have a marketing-crush on their copywriter.
Grand Rapids Public Library turns out some nice print material.
Art 180, Gallery 5, John Tyler Community College (I know, I know, but they've got at least one GREAT graphic designer on their staff. The junk mail they send me ends up on my design bulletin board.)