To download youtube videos you simply have to add "kiss" on front of youtube in the url:
To download the video at the link :
http://www.youtube.com/watch?v=Wv6u8GNivr8&feature=PlayList&p=5C2E2FEED0B28897&playnext=1&playnext_from=PL&index=35

add kiss

http://www.kissyoutube.com/watch?v=Wv6u8GNivr8&feature=PlayList&p=5C2E2FEED0B28897&playnext=1&playnext_from=PL&index=35


1. Accept the security warning as shown above
Select the Quality of video HQ for high quality and arrow pointing down for normal.

Good download.