I gave a presentation on Glassbox yesterday at the Dallas Java users group (JavaMUG)
Here's a link directly to the presentation entry: Dallas JUG Glassbox presentation
At some point a PDF of the slides will be posted there. These slides are a reconsolidated and personalized version of what Ron Bodkin gave in the Google Video Glassbox presentation.
Glassbox is an Open-Source Automated Java Troubleshooter and Monitor. I'll post a link to the slides when it's available.