It's a nice thing, finding a great educational video clip on YouTube. Using video to explain some educational idea you are teaching in the classroom is great, but modeling a valid use of a video-hosting site like YouTube to students is something the students don't see often.
In AISD, teachers are able to authenticate their way through the firewall and get access to the video. However, depending on the time of day and volume of network traffic, 'having' and 'using' YouTube access can be two different things. Enter KeepVid.com.
The trick to streaming video in the classroom is, well, not to stream it. Even DiscoveryStreaming will let you download the video clips. YouTube doesn't make it one-click easy, but KeepVid will let you take the URL of the clip, paste it into the URL block, and then download it in a few different formats. Once downloaded, the video plays quickly without lag because it is already on the computer.
There are a number of ways to accomplish something like this; browser plugins, Safari resource list, etc. How do you use YouTube in the classroom? What tips do you have that may help others?