Hamachi

Wouldn't it be cool if you could organize multiple computers with an Internet connection into a virtual network for direct secure communication? Wouldn't it be even cooler if you could do it for free? Hamachi is a UDP-based virtual private networking system. It allows two or more computers to connect directly, even though they might be sitting behind different firewalls or broadband routers. Using Hamachi, users can access computers remotely, use Windows File Sharing, play LAN games, instant message, and run private FTP servers… for free!
The interface is clean, functional and polished. It installs quickly and painlessly, and uninstalls completely. The first time you launch the software, it opens a tutorial to help you get started. From there, it's a snap. My husband and I had it installed, running, and were able to communicate with each other in minutes flat. It's unbelievably easy to setup and operate!
Though it's still in beta, there are versions of Hamachi for Windows, Linux and OS X. Could this be the future of P2P?