New EC2 Region: Northern California

Python 2.6.1 (r261:67515, Jul 7 2009, 23:51:51)
[GCC 4.2.1 (Apple Inc. build 5646)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import boto.ec2
>>> regions = boto.ec2.regions()
>>> regions
[RegionInfo:eu-west-1, RegionInfo:us-east-1, RegionInfo:us-west-1]
>>>

From the news brief:
*The Northern California Region*
You can now choose to locate your AWS resources in our Northern California Region, which like other AWS Regions, contains multiple redundant Availability Zones. Utilizing this Region can reduce your data access latencies if you have customers or existing data centers in the Northern California area. This new Region is available for Amazon EC2, Amazon Simple Storage Service (Amazon S3), Amazon SimpleDB, Amazon Simple Queue Service (Amazon SQS), and Amazon Elastic MapReduce. For Northern California Region pricing, please see the detail page for each service on http://aws.amazon.com.

Soon, in 2010, we'll have an Asia region based in Singapore.