Or, I'm a member of a meta-charity called Foundation Beyond Belief, in which my contribution is distributed to various nonreligious charities based on priorities I set (e.g. 25% of funds to environmental causes, 50% human rights, 25% poverty, or whatever). So for Watsi, maybe I could predefine, say, types of medical treatment, country/region, etc. and then the system heuristically determines where to disburse.
And now that I think about it, Kiva optionally does something similar, so that loan repayments don't just sit stagnant in people's accounts because they haven't gotten around to manually distributing them.
Check it out: