I'd love to join or even GM one but I don't have many RT books (only core book so far) and I'm always sceptical at hosting pbp games as they tend to die out and then I've "wasted" alot of time thinking about a story arch.
Than what about Skype?
The major problem I have with pbp is not the format, but lack of continuity. People just stop posting. I don't think that will be much different with skype. I DO prefer skype, as I can do the voices and the progress when skyping is much greater. But online the problems arise with timezones and the like. I'm Norwegian and thus have european time, americans wake up about the time I get home from work for instance.
If people would be open to play post by post I'd be up for it, but I'd most likely take one of the premade adventures as a START just to see if people interact and stick to it and then after the "intro" go all out.