You should know that you are a one man team. Go out and build products and sell the products you build. It's good to be a programmer with biz dev skills.

what are your favorite biz dev skills?

Symbiotic software partnerships. Your added value as a programmer is ever increasing with the growing importance and availability of APIs on the web.

These get you in front of customers. They add value to both softwares. I'd recommend an article like this: http://digitalcapitalism.com/2009/04/api-marketing/