Another Project Management question

Hi,
I have been following the discussion regarding PM software and am glad to see discussion in my local (geographic) community. As a member of the community here online and in Portland I have a question I would like to ask about project management.
I am involved in a social movement in Portland called Fair Trade Music as web admin among, other things, and have begun trying to use the Storm Module for project management. Despite it being setup for software development, which this campaign isn't, I believe it is flexible enough to suit the needs of our campaign except for one key aspect, people can't be in multiple organizations. As a musician who is involved in the campaign, it makes it hard to do things like keeping track of tasking and who I am involved with in our projects. Also, having never done any software development I am not incredibly familiar with this type of tool and how best to use it. In reality this is about managing a social network, not a business, we don't provide any services for money per se. I'm honestly not sure what we could do that would require invoicing. At the moment we are using one huge ridiculous spreadsheet as a method of keeping track of who we are in contact with and about what but it is entirely too cumbersome and unwieldy for any sustained use. So my question is really whether I am barking up the wrong tree? Can any of the project management tools do what I am trying to accomplish? I am convinced that simply adding people to multiple organizations in Storm would do the trick but have no idea how to accomplish that due to my skill set. Any thoughts, recommendations or questions are greatly appreciated.

Thanks,
Graham