Oh no, not another communication channel?! We already have Google Wave! (BTW, I have quite some new invites...)
Well, you are right. But I could not resist: blueobelisk.stackexchange.com...
Update: any question about Open Data, Open Source, or Open Standards (ODOSOS) is welcome. As well as any question on if and how some chemical question could be answered with ODOSOS tools. It is not restricted to the Blue Obelisk or the projects under the wings of the Blue Obelisk. All Open Data, Open Source, and Open Standards in chemistry is worth asking about.