I run a large meetup (SVNewTech), and agree with a lot of the points this article makes. I've tried to apply the email marketing concepts to my startups, and have seen others do so, as well (Convore & Quora come to mind).<p>One interesting aspect of Meetup's email strategy that the author doesn't mention (because it's only tangentially related): Meetup.com doesn't give organizers access to their community members' email addresses. The only way for the organizer to contact the community is through Meetup - this creates lock-in to the service (and much frustration). It's probably a wise business policy for Meetup, but becomes a point of contention for the organizers of larger groups.<p>On a related note, Meetup seems to succeed in spite of itself. They recent released sweeping changes to the design & functionality of the site without notifying organizers, resulting it this epic thread of discontent: <a href="http://www.meetup.com/boards/thread/10376961/0/" rel="nofollow">http://www.meetup.com/boards/thread/10376961/0/</a><p>I think there's a great opportunity to create a service like Meetup that addresses some of these downfalls. If anyone is interested in building something like that, let me know: joe (AT) svnewtech [DOT] com