For the past few months I have had several of Taschen's Web Design series books sitting next to my desk. I often spend a few minutes flipping through one of them when I need to take a break from coding, and I always get inspired.
These small-format books offer what they promise: screen grabs of (usually) well designed and well thought out sites. And at less than $10 a piece, it's pretty easy to build up a collection.
What I enjoy the most is that there is very little discussion on the sites. Every book starts with one or two case studies, but after that you get just a screenshot, tools used, budget (hours and/or money) and people involved. It allows me to form my own opinions on the site, and the ones I am interested in I'll go check out online.