Jonita and me met Christian Strauf, aka tassian on #gnomemeeting, in Brussels last week. Christian was present for a 6Net meeting organized at Cisco. It seems that GnomeMeeting is very often used in such meetings to show typical IPv6 application porting. We discussed about IPv4 and NAT, but also IPv6, and multicast. It seems that multicast is a "must have" on the long term in GnomeMeeting.
Here is the a link to the picture.
I recently added IP detection in GnomeMeeting using seconix.com and not anymore ILS. That permits to have IP translation easily working even if you don't register to ILS. I also added support for the iLBC codec that should be soon standardized by the IETF. It gives very good results especially when there is packets loss.