How to download youtube videos to my iphone 3?

So i'm going on a 12 hour trip and i would like to have some funny you tube videos to watch along the way. How do i get them onto my iTunes account? I need the easiest way possible please. I will vote for best answer!

First, download and save youtube video into your computer with a free online site to get it fast, I recommend you the best site I have tried: http://shareyoutubevideo.com
Second, input the videos you have downloaded to iTunes and sync with iPhone3.

Easy and clean, without downloading any program.

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