Youtube does not need any introduction, once a while you are logged on to this site to watch and share you favorite videos.
There are many ways to download videos from Youtube site, but most involves downloading and installing some third party software.
Here is the simplest method to accomplish this task of downloading videos on Youtube. Log on to site : http://www.vixy.net/ and then type the URL of the video you want to download.
Make a quick selection of format type from drop down and then hit the start button. 
Service on this site allows you convert a Flash Video / FLV file (YouTube’s videos,etc) to MPEG4 (AVI/MOV/MP4/MP3/3GP) file online.So, now you know the easiest way to download, ever so watched and dear videos at Youtube!
Its converting function is very attractive,but I wonder its transferring speed.