Except that WebDAV isn't really new and it is a ratified standard that
basically everyone is adopting!

Ah, well, new is in the timespan of the beholder. To me, Web-based anything is "relatively new"....

(but, yes, I should have included the acronym in the first place!)

The key with WebDAV is that use therein means that you can point WebDAV
enabled Mailman at Zope, IBM's websphere, Apache+mod_dav, or any of the other
WebDAV enabled HTTP servers out there and it should "just work" (assuming they
did the implementation right). There is nothing proprietary about the
solution and choosing it as a foundation for archival/management of
messages/attachments opens doors (instead of closing doors).

Yeah, I understand the point. But understand that virtually everyone claims ubiquity long before they actually have it, too...

I'll research some more about the web servers I use.