Wandering around the South by Southwest Conference in Austin this weekend and yesterday, I was struck by how few people were sporting MacBook Airs. iPhones, on the other hand, were everywhere. I watched four impromptu demos of new sites on the iPhones of four different entrepreneurs. The interface was awesome, but the EDGE network certainly gave the entrepreneurs plenty of time to talk while their sites finished loading. When quizzed about computers, however, some said they didn’t bring one to the event while others confessed that although they thought the Air was sexy, they weren’t sure it was for them. And yeah, Twitter is still big.