I'm looking to buy my wife a new laptop and I'd like to get one that is WiDi capable. What exactly do I have to watch for? Is the processor the only thing that matters or does it need to have something else like a certain wireless card? BTW I know I have to buy an adapter for the TV, I just want to know about the laptop itself.
I have a WiDi setup in my house. You have to look for a laptop with the second generation Intel Core i3/i5 or i7 processor, Intel HD graphics and Intel Centrino WiFi in the laptop. You need a companion WiDi box to connect to your TV. Examples are Netgear PTV 2000, Belkin ScreenCast, D-Link DHD-131.
The first generation Netgear PTV1000 also supports WiDi. I recommend the PTV2000 because it supports 1080p, 802.11n and Blu-Ray content. If you look on the Best Buy website you can filter laptops that support Intel Wireless Display.
I have an Acer AS4830T Core i5 laptop and a Netgear PTV2000 box and it works well.