You can easily accomplish the same thing with Mozilla add-ons but sometimes you just need to use a youtube video for a class (with inaccessible wifi) and you don’t have much time to prepare and you are using someone else’s computer. Keepvid is great for downloading youtube-type videos onto your hard drive. It’s so simple to use, and all you have to do is type in the url of the video (easily accessible through the “share” button in youtube). Once you type in the video’s address, Keepvid will ask you what type of formats are available and then, voila, it’s on your desktop. Very snazzy.