If people are interested in this stuff (and I hope a lot are), the Planetary Society [1] do weekly podcasts and events and talk about this and other areas. The Benford's are always good to hear because they're articulate, clever and so enthusiastic (the Economist cartoon has a Benford present as well I think).

A recent event was recorded in Pasadena "Is this the Starship Century?", a 90 min video with some great discussion about spaceships [2]. A book is out as well. It's good to dream, isn't it?

[1] http://www.planetary.org [2] http://www.scpr.org/events/2013/09/25/1153/next-the-starship...