Where is the path (or street)

A split-screen map, with the Ordnance Survey map on one side and your choice of Google map on the other.

It might be interesting to try two types of Google map on either side of the screen, or four types in each corner. Overlay maps—and I’m thinking specifically of Google’s hybrid version—obscure some of the visual data. With side-by-side you don’t get this; it just takes up more space—a forgivable sin if you’re building a map for monitors only.

Migurski found this via Tom Taylor.

Or nine! Tom Carden made this http://www.tom-carden.co.uk/flash/hello-oakland/ using maps from http://teczno.com/old-oakland/