Dave Klein, frequent NFJS attendee (who also works behind the scenes from time to time) started an NFJS Alumni group. If you've ever attended NFJS (or thought about attending), I'd encourage you check it out. It's brand new now, but should grow.
If I can speak for Dave (he created the group during one of my talks), the intention was to give people a way to extend the experience and discuss the talks, etc after the show. Maybe even discuss them with attendees from different cities, see what talks are hot this year, etc.