If you are using Amazon EC2, then you would find the new AWS Management Console as a very useful tool. I agree you can have the same functionality using normal SOAP API but this is cool. As I see so far it is just read only data, but provide a handy way to look at the instances you have, AMIs you have created, various secuirty gropus, kep-pairs and etc.., I think it should provide additional methods such as,
- terminating an instance
- Deleting an AMI
- And may be remove data from S3
Then you can do most of the work without worring about the command line tools.