I wrote a library called winp that lets you do lower-level process managements on Windows. So far it includes things like killing random processes (not just the ones you launched), killing a process recursively, or finding out the environment variables and command line arguments given to the process.

My short-term goal is to use this in Hudson so that I can clean up the run-away processes (which are often left by jobs that deal with daemons like application servers), but I thought this kind of features would hopefully be useful for other applications.

In this library, I created a DLL without linking to the C runtime library, which helps me keep the DLL file size rather small (currently around 6K.) To use this library, just put winp.jar in your classpath — As with all my other projects that deal with JNI (like com4j), there's no need to deal with a DLL separately.