I saw your request under the training heading, and that's what i love doing.
Although I've worked with CRM's like sugar & Maximizer, I've only just looked under the hood with Zurmo.
I still need to get around how the package works, like products etc.
I don't have the all the skills at this time to add the invoicing module, and would be a bit hesitant to try that on a live site. I have however set up my own in-house site running on Ubuntu this weekend to have a play, and its looks like the CRM's have progressed since i installed SugarCRM many years ago.
So I'd love to be involved, but i don't know just how much of a developer you are looking for. My My side i'd like to be involved for the experience, and the possibility of training and possibly assisting your company in the future.
Thanks
Michael Hogg
0421717280