Amazon Web Services on Monday unveiled a new per-second pricing plan for EC2 instances and EBS volumes, which will take effect Oct. 2. The new pricing for Elastic Compute Cloud and Elastic Block Storage used with EC2 instances will allow greater flexibility and efficiency for customers wanting to expand their use of cloud computing data, AWS said. When EC2 launched in 2006, the only way to pay for the service was in one-hour increments, recalled Jeff Barr, chief evangelist at AWS.