I don't know if some of you have heard of Tunngle. It's a program similar to Hamachi that creates a virtual local area network (LAN) online using the P2P.
By checking over YouTube, I found this:
This video is recent by the way, it's been a few weeks it's online.
Maybe it could be interesting to try this out someday.
The little downside: by using Serial Cable, it only supports 2 players.