The release can be downloaded and full release notes found at the RHQ wiki.
I had the luck to give a talk about RHQ at FOSDEM X Read more...
A new video has been made available that explains how to start with agent plugin development.
You can check it out on youtube ( 3 parts )
A video from the talk about "Systemmanagement with RHQ and Jopr" recorded at FOSDEM X is online.
You can watch it either on YouTube: http://www.youtube.com/watch?v=qGTtERJ63xw
or download is as .ogg file from the FOSDEM video page at
http://video.fosdem.org/2010/devrooms/jboss/systems.management.with.rhq.and.jopr.ogg (400 MB)
The slides of the talk are available from http://www.pilhuhn.de/hwr/fosdem10/FOSDEM10.pdf