Here are directions for embedding the YouTube video you want in your powerpoint. This means the video itself is in the powerpoint, not just a link to the video. The directions may seem a little overwhelming but they work if you just work them out one step at a time.
http://docs.google.com/Doc?docid=0AfO4BLB0xsb6ZGhoamQ1emNfOGQzd2czcGRn&hl=en
