myTunes is a donationware program written in JAVA and runs both on Mac OS X and Windows with your iTunes. It acts as a small webserver which creates RSS2 feeds with enclosures (aka podcasts) from your iTunes library and even from each of your playlists!
For what do i use it?
I use it to stream my iTunes Library across my wireless LAN to my Sony PSP to listen to my music while walking around in my house 
It’s really great for that purpose because the webserver fits nicely into the PSP screen, is easy to navigate and you can even search for songs or artists! I really like this piece of software – give it a try.