'Data set processing' is about to change the way you can manipulate object date with nodes. Lukas Tönne [phonybone]is working on this new experimental feature. Check out this demo and remember to close your mouth while you're watching:
Introducing a new data processing system that can handle larger sets of elements from all kinds of context. Also showing how groups work with adaptable socket types.
For in-depth information on this new feature, check out Lukas's blogpost.