Nice fresh sample from Full Scale180’s guys called Cloud Ninja.
“The Cloud Ninja - SQL Azure Federations Project is a sample demonstrating the use of SQL Azure Federations in creating multi-tenant solutions. SQL Azure Federations can be a useful tool for migrating existing single tenant solutions to multi-tenant cloud solutions, as well as building new multi-tenant internet scale solutions. In this project we demonstrate the migration of an existing solution to SQL Azure Federations and further leveraging SQL Azure Federation features in our multi-tenant solutions.”
You can download the code here; http://shard.codeplex.com/