Jethro PMM helps church staff track people, families, pastoral tasks, groups, attendance, services, rosters and documents via an easy-to-use web interface. It doesn't force you to work a certain way, but gives you lightweight, flexible tools to support your type of ministry.
October 2011: Jethro v2.1, with a few new features, is now available for download from Sourceforge. Detailed tutorials and support materials will be forthcoming.
Jethro is free and open-source (GPL) and runs on a standard LAMP web server.
The advantage of web-based church management is that your staff can all access the system no matter where they are working from. However if you really want to run Jethro on a single PC, this can be done using XAMPP
Jethro was initially sponsored by Christ Church Inner West Anglican Community and is now used by several churches in Australia and beyond. You can read a review of Jethro on the Communicate Jesus blog.
Questions and feedback are welcome.