It's supported on desktop as well. Major requirement is you need to have an Ivybridge processor (pretty sure Intel just limited this on the driver level considering that WiDi was first introduced with Sandybridge). Secondary requirement maybe a Centrino based wifi adapter (not verified but I am pretty sure you are going to need this). There are currently 2 Centrino SKUs that Intel has made available for the desktop platform: Advanced-N 6205 for Desktop and Wireless-N 2200 for Desktop (they are basically the laptop SKUs strapped onto a PCI-e to mini-PCI-e adapter). The former is dual band while the latter is single band. Both support WiDi. newegg sells both of these adapters.
As it was already mentioned, wireless HDMI is not WiDi.
Still not what I'm looking for. Bravia's are WiFi and WiDi compliant (certain models). Why duplicate the TV side? BTW, thanks for the efforts, but I think it's time to quit. I've got a request in with Sony for support on this issue. If/when I get a response I'll post it here. Again, Thanks.
Because WiDi only works with Intel-based laptops (and certain desktops) you aren't going to be able to USE it with anything else. There are NO WiDi transmitters in existence, and wireless HDMI WILL NOT work with WiDi, they are completely separate technologies.