Let's go the other way... Let's suppose I am a hacker and I am looking for a business type or partner for YC, what kind of guy am i looking for?

Assuming that there is already trust and respect - I would want someone who can bring this to the table:

1. someone who understands a particular market & its needs 100%

2. someone to bounce design/sales/marketing discussions off

3. someone who has social and professional connections that I don't have

4. someone who can cook (because I don't have this skill)

Out of all these 1 & 2 is most important - as hackers don't usually have a good sense for UI and users.

If you find a hacker you want - sell yourself with these points.