Tube, Google Video, MetaCafe, DailyMotion, Veoh, Break, and a ton of other similar sites. Whether you want to watch the video on your iPod while working out, insert it into a PowerPoint presentation to add some spice, or simply download a video before it
"When it comes to interactive virtual views, we have gone to space and around the globe. So, it's not surprising that we are also going within ourselves on a virtual journey of the human body. One of the finest tools available online is Visible Body. Unfortunately, it's not free anymore. But you can see the beauty of it thanks to the free demo that allows you to explore the head and neck."
Note: the first on the list requires Chrome or FireFox4