You can create your own MySpace group, giving members several more avenues to discover you. You can attract a wider readership by forming a group dedicated to your subgenre or topic. And by doing a good job of running the show, you'll establish your credibility as an expert in your field.
If you already have a big, dedicated following, you can make it all about you, starting a fan club Group for yourself on MySpace. Or you can enlist one of your friends to do it.