My own main motivation wasn't just privacy, but also resilience (against, say, hurricanes) and fun (the web doesn't have the same joy it once did).
So my favourite interview so far is the mobile mesh network one http://redecentralize.org/interviews/2013/08/14/04-paul-serv...
I also think it is important that new algorithms like DHT (Kademlia), BitCoin and GFShare get known and used to their full extent.
Please get in touch if you've a project that would like interviewing!