Most sites that let you download videos from YouTube don't give you an option to convert them to a more convenient file format so you end up with a FLV file, which you probably need a new media player to play.

Save2PC saves you this trouble by letting you download videos from YouTube and Google Video and at the same time convert them to AVI or MPEG files that you can easily play with almost any media player. You can also leave them as Flash video files if you want.

It's a free tool that you install on your computer, and all you need to do is paste in the URL of the video you want and press Start to save it.