This action item is particularly interesting: "Server: we need to write an App Engine server for testing, local development, and potentially production deploy

This action item is particularly interesting: "Server: we need to write an App Engine server for testing, local development, and potentially production deployment. (Replace Bigtable with MySQL, Hypertable, Hbase, Couch DB, etc.)" An open-source production-capable alternative to AppEngine (that uses its APIs) would help defuse the lock-in issues.