Bridging UPnP Networks
As part of this years Google Summer of Code, Sunil Ghai (a student from India) has taken-up the task of securely bridging multiple UPnP networks across the internet. You can follow the progress of the project through Sunil's blog.
Before you say it, yes! I did get the idea from my "competitors" but unlike them, we are going to do it the (UPnP) standard and efficient (as usual) way.