Marc Ringuette, and Yanek Martinson are some of the folks on this list who are interested in working on DC-Nets....Yanek even claims to have a primitive one running on his local machine and is interested in volunteers to test it on a larger basis.
I did write a dc-net system in perl that uses e-mail as the transport mechanism. It worked quite well when all the "participants" were on the same machine, and with immediat emessage delivery, no batching or queuing. As soon as I attempted to run it with a few people over the net, there were severe synchronization problems. E-mail messages are not guaranteed to arrive in the same order as they were sent, or to arrive to all the addressees within the same time frame. DC-nets work only if all the participants see the same set of messages in the same sequence. I have since decided that e-mail is not a very good transport mechanism for a dc-net and am experimenting with tcp/socket connections instead. That seems to be working pretty well, but has quite a high load on the network. If someone does want to work on some sort of a synchronisation protocol for the e-mail based dc-net, let me know and I will send you the perl code. The tcp version is not ready enough to give to anyone, and I have been quite busy with a few other (only marginally cypherpunks-related) projects and can't spend very much time on the dc-net system.