I would participate in something like this in my spare time.
I think the thing about open source is you can create many additional add-ons to charge for, services to charge for, support, installs etc. It could also be good practice for those beginner programmers to learn how to use classes and such. If someone is interested I would be more than happy to sit down and discuss it and see what we can put together to get started on it. I on't have a lot of spare time but after programming for 13 or so years I do have some experience and I have worked on opensource projects in the past. (phpGroupware - one module and a looong time ago

).
Andy