As the resident Google Earth guru here, I'm thrilled to learn from BikePortland that Metro's excellent Bike There! map is available as a .kmz file. This means you can see all of the routes in 3D, flying and zooming to your heart's content. If you don't have Google Earth yet, download it here.
Also great for route planning: byCycle.org, a site that that gives you turn-by-turn directions, optimized for safe cycling.