I recently read an article on Ars about this and the thought there is that Google will not be doing deduplication in order to avoid lawsuits. Link: http://arstechnica.com/tech-policy/news/2011/07/are-google-music-and-amazon-cloud-player-illegal.ars

I've wondered what Amazon's reaction would be if B&N actually allowed the Kindle app to be installed and run on non-rooted Nook Colors.

That would be useful! I had never considered configuration files.