I like to save youtube videos I really like so I can watch on my TV anytime, fun to watch when friends are over and such. There are several extensions for the Google Chrome web browser that add a download button below the video on youtube.com This allows you to quickly and easily download the video in any format available, all the way upto 1080p!
Many of these extensions no longer work and there isn’t any in the official Chrome Extension directory. This one currently works great though, the one I was using before stopped working.
You want to download the MP4 versions for best video offline playback, if you run a Windows prior to Windows 7, you may have to install a codec pack to play MP4 files.