Wow. I hadn't realized this was still getting attention. I just got an email about it, and I'm going to resurrect this and actually finish it.
Here's the current state: I have a working, um, "alpha". It does not use the database abstraction layer — it currently only works on MySQL. There is no installer (I don't know how to do modx, if anyone does, contact me!). I suspect it also does not play well with other mods, but I have not yet tested this.
If you want a copy of the current version, please contact me through my site: www.securityandcaffeine.com
. Eventually I'll set up a Google Code project for it, but for now, do contact me if you want it.