My article Seven Forms Of BPM with JBoss jBPM just got published on dzone. In this article, I explain 7 distinct concrete forms of BPM. Some are more business oriented and some are more technical oriented. BPM is a hugely overloaded term, resulting in a lot of confusion. Hopefully this article helps to clear out at least some of the confusion.
If you don't like clicking your way through the pages, consider the printer friendly format of the article.