I built almost the EXACT SAME APP at a startup weekend. Lots of people have this problem where they'll write something down and then totally forget about it. Our approach is slightly different but very similar.

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We didn't really market it beyond the local press we got from Startup Weekend. We did launch the Mac app the first day of the Mac App Store though so that got us about 10,000 signups.

Good post. Sounds like you have a good head on your shoulders and are doing the right things, so far as the theories are concerned. But as Einstein said "In theory, theory and practice are the same. In practice, they are not."

I'm in a similar situation. I would love to hear how people are tackling these problems in practice, and any success stories.