We have stopped accepting new registration to the free trial program starting October 1st, 2012. The AWS Free Usage Tier now includes Amazon RDS instances. Customers eligible for the AWS Free Usage tier can now use up to 750 hours per month of a single-AZ t1.micro DB instance, along with 20 GB of database storage capacity and 10 million IO requests per month. The free tier applies to Single-AZ deployments of MySQL, Oracle “Bring-Your-Own-License (BYOL)” licensing model and SQL Server Express Edition.