It's better workflow to get a stack of 50 cards & take pictures 1x1 than to manually enter contact info 1x1 at a conference. I want to optimize for facetime while I'm at a conference.
10,000 founders have tried this already. Why will you win? I agree w/ bdcravens, giving someone a paper card is way faster. The ultimate solution is Apple builds Bump into the phone which I'm 90% will happen.
I think "Over Coffee" is just the name. Idea would be that if there's mutual interest you start talking over email, then can go further or not as you'd like