I've been wanting to access the internet video facility on my Sony Bravia 'internet ready' TV for a while now, but was put off by the price of the Sony USB wi-fi dongle and also reviews that said it doesn't work well if your router is positioned in a different room from your TV.
I looked at various options and read lots of reviews and forums and finally settled on the Netgear Wifi Internet Adapter. Sony don't let you use any other make of wifi dongle in the TV, but this gizmo works using the ethernet port so gets round that problem. It was simple to set up (plug into pc, key in broadband password, remove and plug into ethernet port in back of tv, update tv using remote). I can now access loads of internet content with no problem, including BBC iplayer, Youtube, Demand 5.
The device is tiny and light and can be powered from the TVs USB port so no need for any trailing cables.
Highly recommended.