I'm sure that this will get someone thinking.

In Edgeio and the "Write Once, Publish Everywhere" Web, Bill Burnham writes:

What’s needed then for services like Edgeio to really take off is a new kind of blogging platform, or at least an extension of existing blogging/social networking platforms, that explicitly contemplates and enables people to post and manage listings. The sites that are coming the closest to such a platform right now are the social networking sites, such as MySpace, which are allowing their users to post an increasing amount of information which they presumably can start indexing and re-publishing, however no one is really doing a good job of it yet.

It looks like all that's needed to get into Edgeio's classifieds is the tag "listing" on a node.
I suspect there's a lot of refinement to be worked out with what's essentially microformats, or
some structure to the listings. I would like to see some Edgeio listing management tools in a
Drupal module.

Anyone else have thoughts on this?