Make a bookmark on your toolbar and put the text below in it
javascript
:if%20(document.getElementById('download-youtube-video')==null%20&&%20!!(document.location.href.mat ch(/http:\/\/[a-zA-Z\.]*youtube\.com\/watch/)))%20{var%20yt_mp4_path='http://www.youtube.com/get_video?fmt=18&video_id='+swfArgs['video_id']+'&t='+swfArgs['t'];%20var%20div_embed=document.getElementById('watch-embed-div');div_embed.innerHTML=div_embed.innerHTML+'<br %20/>%20<span%20id=\'download-youtube-video\'><a%20href=\''+yt_mp4_path+'\'>Download%20a s%20MP4</a>%20(right-click%20and%20select%20<i>Save%20'+%20(navigator.a ppName=='Microsoft%20Internet%20Explorer'?'target' :'link')%20+'%20as</i>)</span>';}void(0);
a magical button will appear below the info panel at the top right, click that to download the high quality version of the vid ! This is a sneaky trick that lets you access the version of the video in high quality that is for Apple tv users.