Adams is an inspiration not just because of his photographs, but also his zest for life with no boundaries. You understand what I mean if you've read his autobiography. Don't miss this NY Times web article with sound byte interviews about him. This is another website with sound from the San Francisco Museum of Modern Art. PBS has a movie about him as well.
Really, next time you need some inspiration to do anything, read his autobiography. When you finally put it down you will feel like you can accomplish anything. You probably won't want to put it down until you reach the end, but it is not very thick, so it makes a great weekend retreat.