This idea appeals to me. I'm ex-Nokia, maemo/meego/... kernel team, and would be willing to spend some of my free time assisting with kernel and low-level-user-space issues. (If you need a kernel tree maintainer, that was much of my job for the last 2 years in Nokia, for example.) I can probably pull in a few volunteers from the ex kernel team, I'm still in touch with many of them.
To be honest, I'm not a huge fan of much of the n900 userspace, some of it's as buggy as crap, and is painfully bloaty, so I don't think people should be getting too attached to it. But yes, my n900 is my daily device, and has been for about 4 years. It's almost falling to pieces, but i've made sure I've got spares so that I never have to be without one.