There is a flickr account that I found online that has hundreds of business card examples. They are all very uncommon ones too. I find this site very helpful when I have to think of something new for a business card. The cards on this site use different types of media to print on. The cards are also cut into many different shapes and use different types of textures as well.
It is interesting to see all of these different ideas that I would have never thought of. They are all very creative. You can also see many different logos when you look at this flickr account that are on the cards. I will defiantly be getting inspiration for business cards from this site.