I must say that my confidence is building... Writing these blog posts really helps get everything off my mind so that I'm not trying to think about too much stuff at once. I consider this blog my "brain cache"... If there's something important, I put it on this blog so that I can "forget" about it. If I need to recall something, I can find it here, in my brain cache.
My confidence is getting higher that this startup can become successful. I'm excited about the fact that I would enjoy the service and look forward to using it; I'm pretty sure I'm not the only person who would feel this way. The UI layout looks pretty good, at least IMO, and there really isn't anything that would throw a user into "feature shock".
My other fear (a much bigger fear) was that it would be hard to capture a market. I'm not really afraid anymore - I know that I will use the service, and if I find it useful, so will others. There is already a proven market, so we're not creating anything from scratch; we're simply exploring an area that others have neglected.
While all of the other markets that I previously discussed are good, I don't really know them all that well. I haven't personally experienced the problem that I would like to solve within each of those markets. Those other markets aren't really traction gainers, either - although they might be able to bring in much higher RPU (revenue per user), I would rather make more people happy and take less revenue.