Great stuff, thanks!!!
I'll have a more detailed look and come back to you.
I have released version 1.1 that allows for configuration of the monitor's log file rollover period.
Nice work (and the wiki too!)
The only thing I would have made different would be to reuse the existing loggers, configured by conf/log4j.xml so as to have a more flexible backend (e.g. log to the console or to different files). The code would be somewhat simpler, too. However, what you do is overall simpler because it gathers all the configuration in one place.
I'll probably integrate it to the jboss codebase for a future release--when I find the time--under a slightly different package name, like org.jboss.monitor.services or org.jboss.services.monitor.logging. I'll let you know, anyway.
You should put also your name in the code; you are the copyright owner!