Thanks for taking a look and pointing me to TopicBox! There are some overlaps (team collaboration based on email), but I think that's ok. There is plenty of room for improvement in this area. My focus has been on simplicity. I don't think we need to re-invent the listserv concept necessarily - but I do see a huge opportunity to make group email discussion lists (mailing lists) much more streamlined, simple, and intuitive.

Making group collaboration easier seems like a win no matter what.