EBS-optimized machines should greatly benefit Hadoop, elasticsearch recovery, and probably anything else with a heavy write load.
Launch EBS-optimized boxen on EC2
Were some ebs-optimizable instance types deliberately omitted? I'm especially interested in c1.xlarge instances atm.
Here is the list of seven ebs-optimizable instance types: http://aws.amazon.com/ec2/instance-types/#instance-details
I doubt the omissions were deliberate; put in a pull request, and I'll get it into the next cut.
Oops, spoke too soon-- looks like this was addressed in #283, cheers