From what I read about edgeio (also here and here) this seems to be a wonderful implementation of the edge-content ideas. It seems so exactly because it is built to leverage some common behaviour.

There will be no need to use a different interface for entering content into the system (other than simply tagging the posts), thus it will be immediately available to millions of bloggers without the need to enter the classified into the system.

The challenge will be how to deal with potential spam abuse of the system, but i guess that it has already been tought out…

I also see potential fallbacks of this idea in other areas e.g. that of review collection (anyone thought about edgeviews??), the simplicity and elegance of this tagging technique could solve the un-edgy feeling of most web2 peer production efforts.

P.S. having DW on board might have helped in getting syndacation right…