Yes I got it running. my config is JBoss 2.2.2 + Tomcat 3.2.2. JDK 1.3.1_01 on Windows 2000.
Woohoo! I downloaded 2.4.4/4.0.1 and FORM authentication now works for me.
Alphafoo, could you please post the details of your form-based authentication setup and mention in what application environment you are using it. Just to give me some sense for where form-based authentication is and isn't suitable.