Amazon web services recently introduced a free tier, where you basically get free stuff to try out AWS and run tiny sites and projects. Basically it's free as long as you remain below a certain limit of bandwidth, disk storage etc.
Since going over the limits can quickly become quite expensive (for a hobbyist) I would like some recommendations or suggestions about which AMI's I can run on the free tier, for the purpose of trying out Ruby on Rails and/or Django.
Best Answer
Use the Amazon Linux AMI. It's the only AMI that's officially supported and maintained by Amazon. It's optimized for EC2 with the ec2-api-tools included, boots from EBS, and a package repository that's hosted on EC2. It also includes great features like CloudInit.
There's more info info in the Amazon Linux AMI User Guide.