Take off the developer hat for a moment; how would App.net improve my life? I read a great piece of marketing advice recently: in one sentence, create a problem, then tell me how your product solves it.
From my personal blog post: "Although Paul Graham is specifically describing a hypothetical new search engine rather than a new realtime feed service/API in this inspiring blogpost, his assertions about the power of 10,000 committed users are highly relevant:
The way to win here is to build the search engine all the hackers use. A search engine whose users consisted of the top 10,000 hackers and no one else would be in a very powerful position despite its small size, just as Google was when it was that size.
Since anyone capable of starting this company is one of those 10,000 hackers, the route is straightforward: make the search engine you yourself want. Feel free to make it excessively hackerish. Anything that gets you those 10,000 users is ipso facto good."
I think you would be able to reach more people more powerfully if you spent more time talking about your vision for what Twitter could have been had they not gone the ad route. As a designer working in the web industry, I am just as excited as you are about the potential for this thing, but I think most people need it explained a bit further to really get on board.
Perhaps you could highlight some of the really cool stuff that was built with the Twitter API that they then squashed. Talk about the potential OUTCOMES of this system, not just the origins of it. Hell, maybe even take some proposals from excited designers/developers for what they would do with said API, then use those proposals as a demonstration of the system's potential.
You've got my money.
UPDATE I appreciate and agree with the feedback that we could explained things earlier and more clearly. Updates to our page coming soon.