I was checking out Edward Tufte's site the other day and I noted that he is going to be returning to Minneapolis again for his seminar. I've been to his seminar twice and would consider going a third time but I'll be out of town. If you haven't been to his seminar before I really recommend it. It's like taking a bath in high quality analysis of visual displays. Even if your day job doesn't directly involve designing it is still a very worthwhile and educational way to spend a day. Plus you get copies of all four of his books.