How to watch YouTube videos offline (on OS X)?

Lately I have been traveling a lot, and I was not able to access the internet all the time; but I still want to look at some YouTube video, for example the greate Google I/O Sessions...

My needs are simple :

• running on OS X (Lion)
• download the video easily
• no need to convert the file (to be able to read the file as soon as possible)
• free

After some basic research, I found an easy way to achieve this using the following softwares:

• Enolsoft Free YouTube Downloader HD : this software allows you to download easily the YouTube FLV on your hard drive. 
• VLC Media Player : to play the FLV file locally. 

  Enjoy!