I don't know of any updated tool. My guess is mc4j will quickly catch up. There is also a new admin console in the works (currently in alpha) with a couple of nice admin features, like create datasources, queues, etc.
If price is not an issue, take a look at
ManageEngine Applications Manager 6 supports building consoles for JBoss JMX and JMX 1.2 MBeans and also provides out of the box monitoring of JBoss 3.x, 4.x. Provides reporting, threshold config, alert escalation etc.
The product has a Free Edition (monitor upto 10 servers).
There is a patch over the version (build 6004) on the website to support 4.0.1 SP1. Pls contact support @ appmanager.com for the patch.
Other Features : Monitoring databases (MySQL, MSSQL,Oracle), Systems (Linux, Windows, Solaris), Websites, services etc.
More about the product : www.appmanager.com
Live Demo [ http://demo.appmanager.com ]
Product Download : http://appmanager.com/download.html
More details contact email@example.com