Web based tools for downloading and converting YouTube Videos

There are dozens of online and offline tools for downloading and converting YouTube videos. If you are in a hurry, just use any of the following three web based tools:



http://keepvid.com/
http://www.videodl.org/
http://www.zamzar.com/

Zamzar has the ability to download and convert, in the same time, a YouTube video to a common format, such as .avi.