The first project I’m going to use this “system” for is a set of testing apps for DS, primarily to verify emulator correctness. The project page is at http://wiki.akkit.org/Nds_test_apps. The page itself describes the project pretty well, but here’s a quick summary:
Two applications for DS will be written, one is a Graphics test, one is a CPU/Memory test. The idea behind both, is to evaluate the correctness of emulation for all graphical and CPU features, and periodically release the applications and information about how well the emulators do in the tests in order to promote improvements in emulation.
This project is nice in that it’s easy to add more users to the development without people stepping on each other’s toes, so I’m happy to add several more people to the project.

Not all of the framework is in place for this project yet. I have a Subversion server and a bugtracker that are both partly ready, I expect to have both of them running correctly soon – they’ll be responsible for making this teamwork possible.
The code for this project will be closed source during development, until a certain level of completeness is reached (this has yet to be decided) – after which point, all the code will be released under the MIT source code license (this, too, is just the current plan, if the team has other ideas, it can change)
We will release binaries periodically, to allow people to test on their own, and to allow emu authors to get a good look at what problems exist.
If you would like to be involved with this project, please email me at sgstair [at] akkit [dot] org.