I'm taking a short vacation, and have just wrapped up the last things I wanted to finish before leaving: putting the ZCO demo application online, and setting up a limited role for guests to see the application from inside Zope's management interface. The URL is http://sgillies.net/zco.
The most interesting combination of demo layers are global_mosaic, zpoints/x, and cpoints/dot. The first demonstrates ZCO's capability to consume WMS, while the others show layers derived from data maintained in the ZODB rather than on disk in the form of WKT geometries in a Zope File (zpoints) and points from a Zope catalog query (cpoints). See demo/zdata/points_wkt and demo/zdata/points_catalog within the Zope management interface.