Some neat feature:
* Basic predefined attack patterns.
* Highly customizable attacks.
* Highly customizable undefined variables.
* Semi automated Xss check.
* User configurable internal parameters.
* Log Window for debugging and tracking.
* History of latest 5 tested SWF files.
* ActionScript Objects runtime explorer in tree view.
* Persistent Configuration and Layout.
SWFIntruder is hosted @ OWASP:
and is sponsored by Minded Security (http://www.mindedsecurity.com)