Contributing back to the community is absolutely the best part of working with any open source project. The drupal community is a particularly amazing group to work with As any attendee of the late and great DrupalCon SF can attest. So I leap at the chance to give back.
First, ChapterThree is making our first public announcement of our features server.
I saw the utility of Drupal distributions first hand at CivicSpace. Beyond technology, the ability to discuss a web technology solution in the context of a specific market (in this case non-profits) is very powerful. Suddenly, you can translate abstract technology concepts ('tags', 'wikis', 'blogs') to specific pain points and use cases ('event organizing', 'taking donations', 'creating a dialogue with supporters').