YouTube Download&Convert, as the name suggests, allows users of the program to download any video from youtube and convert it into most formats - ready for sharing in emails or putting on an iPod (there are many more uses, these are just a couple).
The program itself is surprisingly easy to use - simply tell it the YouTube URL and what format you want to convert it to, and click Download. You can also choose what directory to download the file into. The program then downloads the file - giving you the progress along the way - and then converts using the FFmpeg library. It couldn't be easier.