This is simple trick which will allow you to download youtube videos without any software and in different formats such as mpeg4, 3gp, hd and many more.
First Go to Youtube webpage.
Then go to video you want to download.
Example : http://www.youtube.com/watch?v=3MxEb4qnkF8
Now add save before youtube and press enter.
Example : http://www.saveyoutube.com/watch?v=3MxEb4qnkF8
Now you will be redirected to a new page from where you can download video in any format of your choice
I hope you eill like ma post