Several Oracle products, including the most known database, have been certified to run on EC2. Oracle also prepared VM images. It's not clear yet, but looks like you can use the same image on EC2 and on your Oracle VM Server, but without live migration between the two.
RSA key import
Now you can import your own RSA public key instead of having it generated by Amazon. For the truly paranoid or for those that need to use the same key for many applications. A variety of formats is supported, including the OpenSSH format.
Idempotent Instance Creation
This strange name refers to a new mode supported by EC2 tools: you can issue the same command many times and it will only run once. Useful if you often experience errors and you're not sure if you should wait a bit longer or try again.
Resource tagging and filtering
You can now attach up to 10 tags to EC2 instances, AMIs, EBS volumes and snapshots, and Amazon VPC resources such as VPCs, subnets, connections, and gateways. Web front-end and command line tools now support filters with the usual '?' for a single character and '*' for any string. Multiple filters can be combined with AND and OR. Filters work on various fields, such as names, instance types and availibility zones. All of these make your infrastructure easier to manage of you use hundreds or thousands of resources.
Most new features are described in a new EC2 Developer Guide.
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