I gave $1000 to the Singularity Institute after completing Rationality Mega-Camp. They seem to be a legitimate organization full of smart people doing very important work, and they convinced me of two things: they are working on valuable projects today, and they could be doing a lot more valuable stuff with more money.
This discussion-level article is a handy place for people to share info about their recent donations, especially donations to unusually efficient or effective charities. Feel free to post your one-time donations, your recurring donations, and/or any interesting changes in your donation habits. Gratitude and appreciation for other people's donations is also very welcome.