The whole Google Maps/Google Earth thing is really fascinating to me from an urban planning point of view. How amazing to be able to make hacks of these to show everything from real-time bus routes in Seattle , census data down to individual house level , crime , Iraq war casualties> , geo-linked photos , situationist-ish observations , housing for sale/rent etc.... So why not add layers of tree species, brownfield sites, derelict buildings, housing density, day/night activity levels, etc? let alone the more basic stuff like water, roads, houses or parks that could be on separate GIS layers linked in with the super-userfriendly Google interface - I'm sure there would be geeks queuing up to do the work. All the GIS data already exists in various federal government departments, both in the US and the UK. The UK already has MAGIC a useful GIS interactive resource for planning geeks like me. It's unheard of among the general public and certainly not terribly user-friendly, but...