try "youconvertit" http://search.live.com/results.aspx?q=youconvertit , it converts many formats online, and no need to install anything. it's totally free. it can be used to host and share files.
it downloads youtube videos and many others, or converts them online. it also convert units
How do you convert an audio file (MPEG Layer 3) to a format that you can upload to YouTube?
Or can you?