I would like to ' add ' my own experience to the following
An easy way to save youtube videos- is to go to youtube select the video-
let it load ( leaving the web page open )
go to your Root tmp folder - locate the flash video file - should look something like this ( FlashXXiK8stn )
Right click > Rename - then add .flv to the end of the file name and click Rename
Then right click again and move it to where ever you desire to save the file.
If you are downloading 2 or more files in a row, don't forget that the first one will be over-written if you don't change them before downloading the second one
Also, if you are looking at your /tmp in Konqueror, then the second one will mostly not be visible till you do one of the following, ( or both sometimes )"
--you are looking at /tmp
--you see nothing coming down in /tmp
--click any other directory above or below
--click again your /tmp and the download will be visible
Sometimes it happened to me that had to leave konqueror and open it again in /tmp
Just last week I have been doing that a lot