What if you have a friend whom you've known for about 12 years, has stuck with you through some dicey times, you've worked with on a few things and trust and respect completely, is keen on the idea of a start-up and has a pretty good business sense and gets things done, But he's not passionate about technology. What would you advice?
I think there's a big difference between being passionate about technology itself and being passionate about getting a business/product off the ground using technology. The latter, along with your relationship, sounds pretty good.
YC companies are quite diverse these days and many require as much, if not more, non-tech work and understanding as deeply technical work.