One thing that I think Gittip is going to require is that people actually
ask to receive donations. I'm guessing that the people who are doing best through Gittip do just that. It's a voluntary gift-oriented community, but that shouldn't get in the way of asking.
Chad: one thing I will note is that, though you are very open in the article about what you are making, and clearly you want more gifts to sustain yourself and gittip, you don't actually ask. For gittip to succede you don't just need a volume of people, you need a volume of people who are actively asking other people to participate. And you should start with yourself!
For gittip that plea can take different forms. Well-funded groups can ask for tips that they redistribute. People doing small projects on the side can still calculate out their expenses (my expenses are just a few domain names, but they aren't free) and can ask for exactly that modest goal.
In a sense you want to teach people how to ask, and you want to normalize these pleas, which is best done through demonstration.