For me I used Internet Download Manager - pretty great in downloading videos from any sites including Youtube. You can find it free in the interweb.
please download Youtube Downloader.after that placed URL in DAP and downloading will resolve and after that it automatically starts to download.
YouTube, unfortunately, doesn't offer the tool to download videos on its site. You could use some third party software to do that. I recommend Leawo Free YouTube Downloader. Suppose you are going to download videos with this video downloader, the easiest way is to drag the YouTube video thumbnail to the hover window of Leawo Free YouTube Downloader and then the video downloader will begin the downloading automatically. See the below graphic illustration:
use internet download manager !! (IDM) or if u use firefox try this add ons "unplug" http ://unplug.dbatley.com really works !!100% instal it and go to video u want to download right click then click unplug
sorry but i think all reply hard , if you need to download let's say http://www.youtube.com/watch?v=e0U5Kw57iv4 , u can do that by one of this http://www.linkyoutube.com/watch?v=e0U5Kw57iv4 http://www.kickyoutube.com/watch?v=e0U5Kw57iv4 http://www.kissyoutube.com/watch?v=e0U5Kw57iv4 hit enter after that , but i think you need java program to work good with you download it here http://java.sun.com/
One simple step, Just download the Youtube Downloader software by searching it from google. Then just copy paste the link in the software and its done in minutes.... So easy... Try It
You could also try Freeware Tunebite Downloader and Converter. I use this tool and I have already downloaded any youtube video. The best part is that it can directly convert the youtube videos into avi, mp4, or mp3 or any other video and audio format. Of course I didn't decide to get this one just to download and record youtube videos, but I like the fact that it has so many useful features, it's not only an youtube downloader, but it can also download, record and even capture movies, video clips and also music from any audio and video streaming websites. It's quite good when you look at it this way: when I find a video or movie or a song on any website I browse and I like it, I immediately download and save it in any audio and video format, because it can supports many audio and video formats. I'm pretty happy with it as I have now many audio and video files..