First, a disclaimer: this is my vision of sharing, but I don't yet have experience with a network of people doing this. I have just begun inviting people to join my personal network and/or subscribe to the public Thomas Tolman Family Organization data updates; I will be sure to post updates in this feed as things progress.
So, you've got files you want to share. Here's a way to decide how to set it up (for each folder targeting a different group):
The Thomas Tolman Family Organization publishes it's genealogy data publicly, and you can subscribe to data updates using P2P tools.
If you want to test out any of this back-and-forth sharing (or any other approaches), drop me a line. If you've got any other ideas, drop me a line. There are a bunch of other people working on related issues, so I'm sure you'll find a group with similar interests. This is getting fun!
If you're a descendent of Thomas Tolman, you might be able to find histories of your ancestors in the Tolman Family collection. These are provided by the Thomas Tolman Family Organization, and you can subscribe to their data updates using P2P tools.