Interesting thoughts from Dries Buytaert (developer by training, sales guy by necessity):
Other than the standard things (an idea, passion and the willingness to act), the most important thing that aspiring entrepreneurs need is the understanding that 80% of entrepreneurship is sales and marketing. If as a founder, you're not obsessed with sales and marketing, you're a liability rather than an asset.From: http://buytaert.net/entrepreneurship-is-80-percent-sales-and-marketing