[timdierks]

Google has a bunch of non-profits, and you are suggested one each day, and can choose to donate to it (or any other). It doesn't pool all One Today users into a single donation recipient per day, and there's no pre-commitment.

Dollar a Day looks great, but it basically boils down to you donating to a non-profit that grants to other non-profits and sends you a daily report: they direct the funds and curate the recipients.

One Today also has a nice challenge-match feature.