If you are looking for top quality business cards and/or stationary, you need to visit Dolce Press. First and foremost their customer service is wonderful. Their products only enhance this aspect of their mission. I cannot say enough good things about them. Recently they helped me realize the vision I had for my cards. They just posted about it on their blog: David Burke Photographers.
Here are some images I borrowed from their site. The cards are thick, clean and simple. Just the way I like it ;-)
Front of Card
Back of Card