Podcast Program - Any Suggestions

Can anyone recomend a good Podcast Program?

I've got a few music files which are MP3, I suspect the best way is to create a podcast? Of these and upload them to my .Mac website - once its up and running.
Is this correct? What are the advantages of doing it podcast style.

What´s the difference between a podcast and mp3, all recordings (music that is) are about 4-5min long. Some are voice talking - about 30min+.

Thanks for any help and advice.

 

Thanks, thats cleared a few questions I had about Podcasting - just searched through my application folder and found GarageBand - which I used at college a few years ago for doing a radio show. After a few minutes it took to instal something and open i was given a "New Podcast Episode" option.

I recorded me reading from book to get some soundbites - Shared with iTunes and it saves as an AAC Audio File? Is this rights? So then how do I publish this as a podcast?

Again, Thanks for any help.

 

DONE!
What is so wrong with AAC just realised that all my songs in iTunes are AAC, does it make a difference?

Again THANKS

 

Changed the setting but should have tested it before i replied.

Recorded something else in Garage Band in the "New Podcast Episode" o my off-key singing - if you must know ) Clicked on Share to iTunes - but again it imported as ACC.
Do you need to change something in Garage Band?

 

Yes I have - but Thanks for all you help on the formatting aspect of it.