Rails - Mar 2006 - looking for ad hoc mailing list webapp startup posted on the list a while back...

Someone announced a beta webapp on the list a while back, which allowed people
to form ad hoc mailing list groups. It
had a weird name... with the number 9 in it. But I''ve searched and
searched.... can''t seem to find any mention of it.
Anyone remember what that was called?

thanks,

b