hmm. I do cassandra on EC2 and I can't think of any ec2 specific setup that I need to do. Its just plain ubuntu. I do install my own custom cassandra to stay on top, but I would do that on any ubuntu install.
I think he's talking about making an AMI for his particular packages.
This is an issue for me to. It looks like a hassle and the instructions look vague and all I want to do is just setup a VM on my machine and then run it on amazon.
Turnkey Linux seems to make this better.
I'm guessing you're just using an off the shelf Ubuntu AMI, right?