The VMblog recently announced that Garanitia Data will be releasing both a Redis Cloud and Memcached Cloud on the Windows Azure platform as a service. From David Marshall of the VMblog:
Used by both enterprise developers and cutting-edge start-ups, Redis and Memcached are open source, RAM-based, key-value memory stores that provide significant value in a wide range of important use cases. Garantia Data's Redis Cloud and Memcached Cloud are reliable and fully-automated services for running Redis and Memcached on the cloud - essentially freeing developers from dealing with nodes, clusters, scaling, data-persistence configuration and failure recovery.
You can try out these two solutions free of charge by heading over to the Garantia Data website.