Kaboodle is arguably the easiest VNC-securifier because it
automatically wraps your VNC connections into a secure tunnel
without asking you for any IP addresses or TCP port details.

With Kaboodle, you can also connect two LANs together, and
then connect to *all* of the VNC Servers on the far side, 
using the one connection. In this sense, it's sort of a "VNC
Proxy".

You can learn more here:  http://www.Kaboodle.org

Note: Kaboodle is a product of Echogent Systems, Inc., which hosts
      this FAQ-O-Matic website for VNC.