git bundles could/should make self-hosting easier.
Being able to configure synonym (and spelling) lists would make
some searches more useful.
Might as well dogfood kernel stuff, too, given the overlap and
history between this project, git and the Linux kernel. Would
be interesting to have *BSD folks throw their hat in the ring,
too.
Building/testing userspace stuff is often the most
time-consuming, but necessary to ensure future compatibility.