I was really just interested in how the system works.  I'm watching something they do with Maptool and voice chat.  I was hoping for something that was more like a titanpad, but with a map and location markers.  I can't do voice chat though (only an integrated microphone), and am not sure how much I can do at a time.  I guess it would be hard to do one that people could join for brief periods of time whenever they had a chance.
I could have a co-gm and just drag along PCs that aren't online, but that would be a bit weird.  I'm just not sure what kind of tool to use.

How does this RP work?  Are you using it just for the map or for more stuff?   Do you just play on there and then write what happens on here?