True. Now if only there were a good book out there describing how to use it... Any recommendations, EFH?
Actually I've got EFH's book on my "to do" list - a lengthy list with a lot of things on it which never get done, but learning about Jess is up there pretty close to the top right now, so it could happen.
Meanwhile, in the spirit of competition I've found this
list of open source rules engines. Closed-source alternatives (including Jess of course) may be found among the comments. I have no info on how good any of these are other than the article itself; just wanted to stir the pot a bit.