Ask HN: Does anyone want to join a small discussion group?

I created podaero.com to host small discussions with 20-30 users - the idea is that you get to know users better over time and the conversations become more interesting. I'm looking to sign up some users today for one of the groups, anyone interested? I can send an invite code if you email me (email in profile), or I can email them to you if you have contact details in your profile. Would love to hear any feedback as well. I didn't post as a 'show HN' because registration is still by invite code, but hopefully I can open it up to everyone soon.