FWIW, setting JAVA_HOME wasn't enough for my Tomcat install, as I did have it set, yet it didn't find tools.jar.

You know, with all the various installation, configuration, and general stability issues I've encountered in various application servers (Netscape, iPlanet, WebSphere, and Tomcat) I'm starting to wonder if Microsoft has it right after all... Someone please put me out of my misery before I go over to the dark side...