The RESMON module is an example of how to do this (just return a hash).
However, the resmon module itself needs much improvement (it should eventually
be able to be little more than the return command itself).

git-svn-id: https://labs.omniti.com/resmon/branches/resmon2@263 8c0face9-b7db-6ec6-c4b3-d5f7145c7d55