Very stuck here - help please

[Jedi Mind Tricked]

Hey guys, I am stuck trying to download a video off youtube..

I can download small videos from keepvid fine however when I try to download hour long videos, none of the pages load the java applet and I am getting quite frustrated!

I am on a MAC and tried Realplayer but the download isn't picking up the video...

All help appreciated guys

p.s sorry if wrong section I needed the help ASAP