If you have yet to explore AWS and are interested in launching some new applications and broadening your knowledge - without incurring any charges (as if they were exorbitant anyway) - then you should definitely check this out. I've been using AWS for quite some time and it's become a core part of my personal Web development strategy.
The free offer from AWS includes 750 hours per month of micro Linux Amazon EC2 instance usage, 750 hours per month of an Amazon Elastic Load Balancer, 10 GB per month of Amazon Elastic Block Storage, 5 GB per month of Amazon S3 Storage, 30 GB per month of internet data transfer (15 GB of data transfer "in" and 15 GB of data transfer "out" across all services), 25 Machine Hours per month of Amazon SimpleDB, 100,000 Requests per month of Amazon Simple Queue Service.
"We're excited to introduce a free usage tier for new AWS customers to help them get started on AWS," said Adam Selipsky, Vice President, Amazon Web Services. "Everyone from entrepreneurial college students to developers at Fortune 500 companies can now launch new applications at zero expense and with the peace of mind that they can instantly scale to accommodate growth. We can't wait to see what great ideas are set in motion now that it's free to experiment and launch production applications in the AWS cloud."