how do I download video's off youtube?

well the title pretty much says it so how do I do it? reason is I wanna create my own gif images. but I need to be able to download videos from youtube to do it.^ ^

 

Here is the downloader it's the most up to date one. hope it works <3 http://youtubedownload.altervista.org/

 

http://keepvid.com/

Easiest way to do it.

 

cool thanks you guys!^ ^ but I think I'm going to go with RVRs download since he says its the easies way to do it.^ ^

edit: RVR your right keepvid is the easiest way to do it.^ ^ and its a better way too.^o^