I just found MarkFletcher's (the founder of BlogLines and eGroups) blog. I like the way he talks about starting a business, this in particular caught my interest because of similarites to discussions I've had about the future of CommunityWireless and PersonalTelco.
"I've said it before, but I'll say it again [...] when designing a service, assume hardware is free. Assume processing power and storage are infinite. Because they approach that over time, and limiting them does your service more harm than good. In addition, I think at this point you can also assume that bandwidth is free."