CTO at a domain registrar. Our company actually survived the pop and eventually was "sold" for other reasons. The main things I learned from that experience was that it is important to be conscious of competitor pricing and how it affects your market. It's ok to be more expensive than your competitors, but you have to differentiate to back that up. Being expensive just because you're ignoring the marketplace will end up causing trouble. Also, be frugal and focus (although I don't think I really learned this until after I failed numerous other times - sometimes I still wonder if I have learned the lesson).
