The RHQ team has just released version 4.0.1 of its server management and monitoring software.
This release is a bugfix release over RHQ 4 which was released earlier this month. The biggest change is the addition of support for IE 7 and 8, as well as the fix for a memory leak that came from how JBossAS internally has set up the pools for MDBs and SLSBs.
You can browse the full release notes, which also contain a link to the download.
Jay Shaughnessy has written a blog post on what was necessary with SmartGWT to get it to work on IE7 and 8.