Discussion: Several years ago I explored the possibility of undertaking a project to compile and publish a range of topographic map coverage, aerial photographs, and public domain satellite imagery for theGeoZone.com. In the end it proved to be prohibitively costly from the simple perspective of time invested -- quite literally by more than an order of magnitude. So this project was consigned to the "back burner" in 2004.
Interactive Maps — Google Maps API V2
Google Maps API V3
Here's a V3 example which is a work-in-process from a current project (March 2011):