I just got word that we released a version of App Verifier that works on Windows Mobile 5 devices.  Here's the link:

http://www.microsoft.com/downloads/details.aspx?FamilyID=d275348a-d937-4d88-ae25-28702c78748d&displaylang=en

App Verifier is a tool you can use to check for memory leaks in applications you're writing.  It's been around for a while, but previously didn't work on WM5.

Mike