Great to see a conference on the Big Society happening in Liverpool. Less great that it's an exclusive £300-odd per ticket event. I also can't find where it's being held... maybe that's because my immediate reaction to finding out about it was to suggest we could hold a better, free, more inclusive rival conference next-door to it :-)
For ages I've been wondering if it's possible to grind up old milk bottles (and any other domestic plastic waste) and use it as the source material for 3D printing on things like the RepRap or Cupcake. It's great to find that lots of other people have had the same idea, and actually gotten on with experimenting with it.