Best Program to Download Videos From Youtube

What is the best program to download from Youtube with? I'm using Orbit but at the moment Orbit wont download from Youtube.

I use real player 11. There is an option on there to download them and it will get the videos from anywere on the web with real player and usuable format at the end
Heres the download http://uk.real.com/download/player/win/v11/en_uk/?