I really like this feature, it gives a great sense of perspective. It opens the doors to so many development opportunities though:
Fly-throughs of routes you have plotted (as an extension to current routing functionality)
If they are drawn to scale, an ability to measure the height of the building
Use of the hybrid function to drape/view the aerial imagery in relief – admittedly the latter could be a little cache-hungry…
Here’s hoping that we get to see parts of UK towns and cites in 2.5D soon.