So, a while back we started a mailing list with a handful of subscribers from the news.YC community, but after a couple weeks the idea didn't really stick.
On the plus side, we've had a large number of folks (over 100 now) join the LinkedIn group, which is here:
http://www.linkedin.com/groups?gid=86116
Today LinkedIn finally made groups, well, useful, so I'll be killing off the lists, but semi-private discussions are still possible on the LinkedIn group.
I have rejected a handful of people from the group. While I've not adhered hard-and-fast to the "you must have a karma of 20" rule, if I can't find connection to this site or startups I will most likely reject your submission. (For those of you who haven't run a LinkedIn group, there are a lot of head-hunters that try to join every group out there, so there should be some way to keep the group focused.)