I think will really be something, if you dont know what it is, I suggest you immediately go to www.hamachi.cc and find out. It has some ports but not open source, so no easy port... Have asked in the Linux department in the forums, but no answer yet.

To describe it shortly quote from the site:

What's in it for me

Think - LAN over the Internet.
Think - Zero-configuration VPN.
Think - Secure peer-to-peer.

Access computers remotely. Use Windows File Sharing. Play LAN games. Run private Web or FTP servers. Communicate directly. Stay connected.

Technology
Hamachi is a zero-configuration virtual private networking application with an open security architecture and NAT-to-NAT traversal capabilities.