YouTube has HD Videos for quite some time, when a video is available in HD you will see a link “watch in high quality” below the video. Youtube has added a landing page for the HD content recently to make it easy for users to discover HD videos. There are tons of youtube video downloaders and some Firefox addons for downloading youtube videos.
Youtube Downloader HD is a freeware for downloading HD videos from Youtube. While downloading it can convert the video to AVI or FLV. Using youtube downloader HD is simple, copy the youtube video URL and paste it in the video URL field, select the option either HD AVI or MP4 high quality, it will download the youtube video if the HD version is available.
Youtube downloader HD is a freeware for windows and works with almost all windows OS. There is a portable version available if you don’t want to install the app.