I set up this thread to help the conversation along. I do love Diplomacy, but I don't have the burning need to play right now. I'll make some inquiries about what systems the game veterans are using to play online now. I encourage others to do the same, and we'll try to get a platform nailed down.
The more people who are interested in playing the better, because I don't expect that, when push comes to shove, all the listed names will sign up.
edit: Apparently, the cool kids are using this platform, which is the heir to the "Ken Lowe judges" that dominated online Diplomacy a few years ago:
http://www.floc.net/dpjudge/
I can GM, which would allow me to help people manage interacting with the judge. Please have a look at it and post your thoughts, or share a different platform you'd prefer. Don't worry about the technical aspects of interacting with the judge; it's quite simple once you're used to it, and you get used to it quickly.