This seems like a great idea to me. There's one thing that I'm really curious about: can we use grant money to contribute to the yt project through this mechanism? Essentially my entire research group now depends on yt for analysis and visualization of our simulations, and I know that's now true for a lot of people. I really want to directly support core infrastructure development, and would be happy to write line-items into all of my grants (in the way that one would ask for grant money for a laptop for a grad student, HPC buy-in, or an outreach assessment consultant) to provide some recurring funding to the yt project. This would both directly help the project by contributing to salaries, workshops, etc., and indirectly help by communicating to federal agencies that this is an important and widely valued endeavor. But, I have no idea if people have used grant money in this way, or if it is even allowable under NSF/NASA/DOE regulations. Matt, do you have any sense of this?