GCHQ has been tasked with breaking Tor (they're thinking of the children you see), advanced sybil attacks on it seem more likely than not in the near future.

Anyway, like I said, I love all the ideas flying about. But ... I'd appreciate it if in future people don't take material that was written to be interesting for a short presentation and make stupid assumptions, like if I talk about one or two solutions that must automatically mean I didn't think about any other solutions, or am a "lazy thinker". It was a 15 minute meetup talk, not a university lecture series.