Here a nice little trick you can use to download youtube video without using any software or script...

replace the .COM in the youtube url with .DR.AG

example links

original:

http://youtube.com/watch?v=SpVMCRtqhro


change to:

http://youtube.dr.ag/watch?v=SpVMCRtqhro


notice, on the bottom it even offers you to download & convert the video Smile


Have fun :)