I wonder if you get more interesting government contacts for running a Tor exit node vs. a mixmaster mail anonymizer now.

I certainly got a lot of interesting contacts when running a remailer. It was awesome being able to talk to them as a relative peer (since I was doing defense contracting), and explain calmly why remailers are good, what level of monitoring is possible, what security assumptions the whole network operates under, how you would defeat it, and why it wouldn't be worth the effort.