Depending on your browser and its version, you may or may not be able to play this video, which is in native html5 format. This is the format that will be permitted on this board from now on: mp4 video
Great news Tom! You are using Chrome or Firefox, no doubt. IE won't play ogv, but it will play webm with an add-on. For those with IE9 or higher, you can get the add-on here: