Sonatype's Nexus 1.0-beta-1 Released
Nexus is a powerful and robust Maven repository manager, created to provide reliable access to artifacts required for development and provisioning. Maven's central repository has always served as a great convenience for users of Maven, but it has always been recommended to maintain your own repositories to ensure stability within your organization. Nexus greatly simplifies the maintenance of your own internal repositories and access to external repositories. With Nexus you can completely control access to, and deployment of, every artifact in your organization from a single location.
Upcoming Netbeans Maven Intrigatation (3.1) has Full integration with Nexus, If you what to give it a try check latest snapshot at http://deadlock.netbeans.org/hudson/job/mevenide/..