this is very good and usefull but heres a an add-on the the add-on Rated 5 out of 5 stars
this is a great add-on in which u can download youtube videos watchthem more clearly and with a different player. but when i downloaded the videos and turned them into .FLV files i couldnt get them to play. so i downloaded an flv player its small easy to use and is free and it works really well. so heres the link for any body that wants one.