Minor Description
Currently we use an old version (2010-08-31). Bumping the version is one of the first steps needed to take to get the VPC support working.
Version change log / release notes can be found at the bottom of of the following page: http://aws.amazon.com/releasenotes/Amazon-EC2/6015851607401219
I quickly glanced over the document and couldn't find any backward incompatible changes which would break the existing functionality.