It was only a matter of time before someone began to standardizing the digital business card. The people at Contxts (http://contxts.com) have developed a practical tool that stores your business contact info in a SMS format. It's part LinkedIn, and part Twitter to help grow your business network. In my experience it has worked seamlessly with my iPhone and saves me the trouble of constant data entry from new contacts.
The user experience is simple and intuitive while the brand voice is just clever enough to convince me that signing up might help a polar bear or two.