Microsoft recently previewed SQL Azure Premium instance (beta).  This is set up on a per-server basis, that is a server can host SQL Azure WEB, BUSINESS or PREMIUM (P1 or P2) instances.  A database type can be upgraded on the same server.  Important note from Microsoft site :”We do not provide any SLA for SQL Database Premium during preview.”

I am interested in your feedback on this offering – please comment below.

Also to be complete, I am including a link to Amazon Web Services RDS (which includes full SQL Server 2008 or 2012) SLA, of particular note is the ‘provisioned IOPS section of their SLA.