1) is well connected with the startup community (the Scoble's and MG siegler's of the world, as well as angels and VCs)
2) enjoys shmoozing with people. Is usually the last person to leave a meetup or tech event, and always a pleasing guy to talk to with a drink in hand.
3) can think of creative, non-technical ways to get buzz for our product and is great at implementing those. For example, if we were launching at SXSW, he would cover all the event planning, parties, invites, swag, PR stunts etc.
As a developer, these are the skills that I personally lack - and I'm sure there are others like me who would rather focus their energy coding. I find social schoomzing to be a boring and challenging part of my job as founder, so someone who was born to do that would be a huge asset.