It looks like the SpringSource people have taken a cue from Eclipse in having their own version of a release train to help with the various Spring-related technologies out there.
I hope that this is a sign that other open-source communities will follow this release train practice. Once this happens, we can start thinking about staging the various release trains so they are synchronized.
For example, imagine that one week after the Ganymede release train happened, SpringSource had its release train occur. I believe this would promote better unity amongst open-source communities, especially communities that depend on each other in one way, shape or form.