The BRMS (Business Rule Management System) has been in the works for sometime. Well, finally, there is something you can use, which works end to end. This is now part of the JBoss Rules 4 Milestone releases, so please, go ahead and start testing it ! There has been great work going on elsewhere in Drools, with respect to the language features, core engine enhancements and the IDE as well (see previous posts).
For a very interim user guide, you can refer to the wiki Quick Start for BRMS. Much more documentation, tutorials etc is on the way.
You can use the milestone releases, or ideally the snapshots (as found here, referring to the wiki link above to make sure you have the latest info, also keep an eye on this blog).
The best way to get going is to take a look at the quick start guide (linked above) and also have some ideas for a model that you want to write rules over (as one of the first things you will do is configure a package).
As always, you can contribute: helpful bug reports are appreciated, as are contributing some specific examples. The wiki is also available to record notes/tips, which can feed into the manual/documentation. I plan on working on a flash based tutorial (a few tutorials will be needed to introduce the concept).
So, the whet the appetite, some screen shots, which show some of the new rule authoring capabilities, as well as the life cycle management are shown (they are not in any particular order, but you can guess what most of them are showing !).