This tool can be used to monitor BizTalk Server 2004/2006 for suspended messages. Once a suspended message is detected, the message and the message context is written to disk for easy viewing.
Get more information from the original blog post on this topic: http://www.biztalkgurus.com/blogs/biztalk/archive/2005/03/09/WMI-Suspended-Instances-for-BizTalk-Server-2004.aspx