Convert Youtube to mp3; to MP4?

[rtetet84]

Sometimes we’ll keep favorite Youtube videos or Youtube music, so we need to convert Youtube, to MP4, to AVI, to 3GP, to MP3 etc. But how?
By the way, there is no need to download any Youtube downloader. In fact, after buffering, the Youtube videos have been downloaded in the Temporary Folder in our computer. Open the IE Explorer-- Tools ----Internet Options ---- Settings ----- View Files.
So we focus on how to convert Youtube to MP4, to AVI, to 3GP, to MP3 etc. There are so many Youtube converters on the net. Which is the best Youtube converter? No body knows. It’s up to your own taste. I think Xlinksoft Youtube Converter is not bad.
For more information about how to download and how to convert youtube, you can go 
http://www.xlinksoft.com/YouTube-to-mp3-convert/Pocket-Youtube-Video-and-Youtube-Music-with-Us-Everywhere.html

[Raphael]

I just use easy youtube downloader firefox addon it does the job

[hitech]

That is easy, the flv formated is very low quality. How to download videos in high quality?