Best online video downloader

i used to choose keepvid but there are some videos that cannot be downloaded from there...

And http://www.savido.net/ right now is downloading all videos i want to have on my computer, and it downloads from many sites, maybe even all sites :-)

If video just open in a new windows instead of saving it to your hard drive, just right click the video and you will have a nice "save video as..." option in the menu that you just opened :-)