Sometimes I get amazed by the little things. Silly as it sounds, just the other day I was thinking about how cool business cards can be. Very multipurpose. You can get SO MUCH on the back of them.
For instance, I did my PhatFiber sample cards and added this info to the back. So if your front is catchy and creative enough, you have the back that could be filled with loads of useful info. I wouldn't do this all the time but its a great trick and reduces paper use too.