Streaming MP3s/MP4s?

1

Hi, I want to have an XHTML site that has 50-100 MP3s available to listen to. I want them to simply be presented in a list and not like a jukebox type of thing and am wondering, 1, what is the best format to export in, MP3 or MP4 and on a mac what is the best software to use to do so. Also, what code do I use to have them stream and play on the web, and are there any examples of this anywhere?