I have just installed a new New Web TV and YouTube viewer in the EUROCALL Building in SL. It's located in Meeting Room 1, upstairs. You can view the video that is currently available by clicking on the Play button next to the video camera icon at the foot of the SL screen. I actually have a menu of videos available, but I have not worked out a way of allowing anyone other than myself to select freely from the menu without also allowing them to delete an existing video or add a new video. There is a way of making these controls accessible to a named group of people, however, which might be the way to go. I'm working on it!
Here's the SLURL for Meeting Room 1: