With all the different file formats nowadays you sometimes need to convert them. Normally you would download some program to do this for you. Now there is an easier way: ZamZar.
ZamZar allows you to upload a file and select which format you want to convert it to. No need to register, just leave your e-mailadress to get a notification when your file is done.
http://www.zamzar.com/
You can also use an URL, even directly convert a YouTube video:
http://www.zamzar.com/url/
