Most of the time when you see a video on YouTube you would probably want to have it on your disk. But due to server restriction of unavailability of of a download manager you are not able to..So here i come with a very easy solution.
First of all you should Buffer the video completely.
Download videocacheview
Open the vediocacheview.exe
The buffered video is in the .tmp format.
Select the file.
Right Click on it.
Select the copy file to.
Now give a Destination folder for it and then it will be saved over there.
Enjoy downloading video like this..!