I created a flash demo demonstrating the Bundle stuff and blogged about it:

http://management-platform.blogspot.com/2011/01/bundle-provisioning-via-rhq....

This talks about a couple of new enhancements to the bundle stuff as well as just giving an overview of bundles in general.

The blog above provides the link to the demo, but here it is as well:

http://rhq-project.org/display/JOPR2/Demo-Bundles