It's funny. I _just_ got back from seeing a VC earlier today on Sandhill Road, and when I told them we were working on building out a product, they told me I shouldn't focus on that and should come back instead with a business plan. I'm fairly convinced that if I'd gone in with a business plan they would have told me to come back with a product.

Ultimately I think PG is correct. Focus on building out the business. If you spend all of your time planning instead of shipping, you're going to fail.