Application/Server dependency mapping

Answer 1

Since I've not had any answers, and a week's worth of googling has returned nothing (other than one php open source project that's good, but we don't support php in-house) I'm going to go ahead and write my own.

If it's any good, and my boss does not object, I'll open source it.

If anyone else happens to come up with an answer to this, I will change and accept your answer if it works.

Answer 2

Pathway Systems sells such a tool for modeling and maintaining such dependency information called Blueprints. It's less overkill than a CMDB, and would probably suite your needs.