My Sony TV is a few years old and does not support Intel WiDi out of the box. I happily scanned the inventory of local hardware shops in Oslo for a WiDi adapter and found a shop which had one NetGear Push2TV HD-TVadapter in stock.
I really like Netgear equipment, and I'm also using Netgear based wifi/gateway, ethernet over power and NAS.
The PTV2000 is reasonally priced, offers 1080p over HDMI in addition to composite video and analog audio.
I was really excited when I hooked up the equipment and started my Intel WiDi application on my X1. I was equally dismayed when this error message appeared:



The wireless display is quite easy to use. By enabling auto-connect to the adapter, the WiDi widget gets quite useful. It is very easy to activate WiDi and to choose which application to show on the TV, so that the laptop screen is free to use for e-mail and such.
If you are going to use Wireless Display for other purposes than showing movies, I really recommend configuring the screen settings on the TV to use pixel-for-pixel display mode to avoid scaling. The WiDi application allows you to adjust the scaling of the picture so that is suits your TV, but this setting should ALWAYS be set to 15 (no scaling), and your TV should be adjusted to show everything at this setting. Regarding resolution, I had problems running movies smoothly in 1080p, but setting the resolution to 720p worked flawlessly. I will use 1080p for other uses such as web browsing and programming. The only flaw on my Thinkpad X1 is the really low resolution on the built-in display, but now I can enjoy sitting in a comfortable chair, typing on the magnificent X1 keyboard while viewing the Windows desktop in full 1080p glory on my Sony 46". Thank you Intel!