Here is the offical website: https://mycast.orb.com
In a nutshell, this Windows-only application allows you to login to your PC remotely from anywhere and steam your music and videos. Specifically, you can stream them to you Nintendo Wii and Xbox 360.
Upon searching, it looks like no one's had any luck get it to function in Wine. So, I am wondering if anyone knows of a similar application that is Linux friendly?