One direction is for it to say my name and then Founder & CEO of Caltweet.
Or a more generic title of Entrepreneur, Hacker & Hustler.
Checkout http://caltweet.com for more information about my company.
Be as creative as you'd like. Steve Woz has a really cool business card. This would be more of the path of creating a personal business card as opposed to company business card. I also have a bunch of other projects.
Other route to go is to have my short resume on the back.