Michael, this is my personal quest right now. I am working hard to try and figure out how to get webDAV into the OACS, or at least into AOLserver.
One way to do it is simply to have Apache and AOLserver sit next to one another. This might not be the best way to have content be sucked into the CR, but it would allow for file uploading at the very least.
As far as getting webDAV built into AOLserver, a top AOLserver hacker estimated it would take 3-4 weeks to simply get the functionality into it, perhaps 6-8 weeks to build a more sophisticated interface with an API and so on.
I've got some things brewing if you want to contact me.
talli