Jim's posting of the link to the GBC video gingered me up to address something that has been in my mind for some weeks now: creating my first own NXT-based GBC module.
In my opinion, the Great Ball Contraption is a great idea by Steve Hassenplug, setting up some kind of standardized interface for LEGO® based modules to enable them to interact.
Obviously, the real fun here is to actually meet other GBC makers and physically interconnect ones' modules, pleased watching the whole machinery running smoothlessly.
As not least the video mentioned above shows, there already are GBC groups doing exactly this in North America - yet, I'm not aware of any such ones in Central Europe (apart from some individual efforts, for instance by Philo or Jürgen Stuber - if I'm wrong here, please tell me!).
So (picking up an idea of Jürgen) this is a call for participants in such a Central Europe GBC Group to-be - whoever is interested, please drop a comment to this blog entry (or, if you don't want to expose yourself yet, use the contact section of my NXT pages).
Looking forward to your feedback,
Matthias Paul