Download web Videos online (Google or Youtube Videos)
in flv formate. It requires Java enabled. A window may be prompt out which require to click 'Run'.
With the help of http://www.getvideomp3.com videos from youtube can be downloaded in flv or mp4 format.
Other sites for downloading videos are:
Any Video converter can be downloaded from below link by which video can be downloaded from youtube, google, metacafe and also videos can be converted from one form to another. It is free ware.