Exactly, I think the prevalence of to-do list type apps shows a huge bias in the startup world. Looking at the successful website few of them target people building startups. EX: Facebook / Twitter (extroverts and stalkers), EBay (people who have or want stuff), Google (people looking for things), Fark (people with nothing to do).

IMO, the most important questions are “what type of person would actually use this?” and “Why would they use this?”