Amazon has just announced the availability of a new service: the Amazon Relational Database Service (Amazon RDS), based on MySQL 5.1 (AWS Blog, RDS@AWS). They support both InnoDB and MyISAM but not replication. See notes from: Mark Callahan@Facebook, Robert Treat@OmniTI.

RDS's pricing depends on the size of the DB instance, rangingfrom 1.7 GB,1 ECUto 68 GB of memory, 26 ECUs.Also note that EC2 has lowered its prices.

Quoting from the RDS site, this is how Amazon is presenting the value prop:

Amazon RDS automatically patches the database software and backs up your database, storing the backups for a user-defined retention period. You also benefit from the flexibility of being able to scale the compute resources or storage capacity associated with your relational database instance via a single API call. As with all Amazon Web Services, there are no up-front investments required, and you pay only for the resources you use.

More AWS info atProducts,