SQL Azure Community Technology Preview (CTP) was announced on 8/18/2009; SQL Azure is a database in the Cloud that helps easy provisioning of relational databases to be used by Azure as well as on premise applications. Here is the excerpt from the SQL Azure blog (http://blogs.msdn.com/ssds/default.aspx) that mentions the editions and the respective price points:
"SQL Azure Database will be available as a free trial until the service goes live in November. SQL Azure Database will be available in two editions: Web Edition, which will include up to 1 GB of relational data, priced at $9.99 per month, and Business Edition, which will include up to 10 GB of data, priced at $99.99 per month."
Additional information on SQL Azure can be found at : http://www.microsoft.com/azure/sql.mspx.
Other SQL Azure resources:
SQL Azure MSDN documentation can be found at http://msdn.microsoft.com/en-us/library/ee336279.aspx.