Kaboodle is a free, open-source Internet app which provides:

* Complete visualization of your LAN, updated in near-real time.
* A point-and-click interface to take remote-control of what it finds.
* A "personal VPN" capability to securely connect Kaboodle-enabled LANs together across the Internet.
* File transfer, continous network monitoring, and more.

and Kaboodle is optimized for easy use; no TCP/IP expertise required! (though it doesn't hurt...)