Apple Computer released new software Tuesday designed to make it easier for users to listen to the increasingly popular, but largely unstructured podcast offerings. Apple, which also announced color screens for its iPod digital music players, said the new iTunes software <A HREF="http://news.yahoo.com/s/ap/20050629/ap_on_hi_te/apple_podcasting">comes with a podcast directory</A> that lists more than 3,000 free audio programs. It also sports a new menu and the ability to automatically send new episodes of podcasts to the user's computer.