Listed Buildings Map
This is an experimental map using Google Fusion Tables as the data source. As a project under development it's very much subject to change (not only because I'm still working on it, but because Fusion Tables is itself still a Google Labs feature and hence undergoing continuous development). However, it does seem to work reasonably well, so I've released it to the world as a first draft!
You can zoom in to see individual buildings, but the icons aren't clickable.