Still its a great project, even if its only available in two locations in the USA, For a really good overview, try this episode of Twit.tv “This week in Google“, Matt Cutts is the guest and the team discus it at length. it’s towards the middle of the show . I have found the show on Youtube and it’s embedded below.
ArchDaily also have a good overview, and links to other sites, plus the Google Video I also have.
Linking to the site, via the site, you are required to enter a post or Zip code, currently USA and limited to just two cities, Boston were the teasn in Google reside, and San Francisco Bay Area, although if enough coverage is given, I hope the globe comes under its banner.
We all have access to CAD programs, some such as Vectorworks have heliodon software, and can show shadow rather well, I think this give the other perspective of power available from the sun.
Todays photo is one I use to try and explain the suns movement, for a given lat long, and is part of a large presentation of how the sun moves, the effects, not just shadow, but heat and power.
This week in Google Video
The Google video below is the simple overview