Downloading Youtube videos? well, I only use my Mozilla firefox browser with GREASEMONKEY add ons. its very easy to install and very user's friendly. no need to copy and paste the url to a separate software. Mozilla window will have that pop-out button that says if you want to the download the video you're currently watching(youtube only).
thank you mini_0, I've tried to use and visit vidoho.com, it downloads any video sharing website, not only youtube. Thanks a lot.