hello im new at this so can you guys please help on how to download the videos from youtube to my pc...im using ubuntu9.04 pleasee

Check out the flashgot addon for Firefox.

I use the DownloadHelper extension for FFx. It's brilliant. Highly recommended.
cheers,
jdk

There is, of course, the option of doing this from the commandline, as well. You can do so using the youtube-dl(1) command.

First:
Then, after finding a YouTube video you want downloaded (such as this one, for example:
The -b flag will tell youtube-dl to download the best quality version of the video, and the -t flag will tell it to include the video's title as part of the filename (otherwise, your file will be named something like "51fHm6R5le0.mp4".

I am also a fan of the DownloadHelper addon for Firefox, but the youtube-dl command is better for this particular purpose since you can use it in bashscripts and you don't have to have Firefox open to use it. Whenever I can, I prefer using the commandline method of getting a job done because it's usually quickest and teaches you most about how things work inside Linux and computers in general.

Even simpler - Youtube bookmarklet.

This special bookmark for Firefox will add a link on the youtube page that'll let you right-click and "Save Target As..." as an MP4 file.

thank you guys for your help it was really help full

flash video resources
http://dys.lexal.net/flv/downloader.php.


that works pretty good and it works for a number of sites I know there is a firefox add on for it as well.

So tell us which one you liked the best. It will help for future recommendations.
Cheers,
jdk

well for me it was easier the download helper and with the comand lines...is its easier on those 2 maybe cause im a newby with linux lol