Songbird

I use iTunes with my iBook to manage my music. But Songbird is a good alternative. The application hasn't yet hit version 1.0, so it's not quite ready for prime time, but it looks promising and it has some neat features that other media players lack. For instance, Songbird allows you to access blogs like mine through its web browser. It automagically finds any music files and serves them up for you in a list, allowing you to play or download them. Here's hoping this idea catches on.