AT&T has announced a cloud-computing service — hosted networking and storage, akin to Amazon.com's S3, Google's App Engine, and other Web services. Expect AT&T's version to offer higher service levels at a higher price. Called Synaptic, the service will be run from five supersized Internet data centers in New Jersey, Maryland, San Diego, Singapore and Amsterdam. The company has set up a high-profile demo: Teamusa.org, the U.S. Olympic Committee's site, is running on Synaptic.