Don't forget the flat $100/mo account fee for any month you have servers active too. Based on my reading of this fee, having a single server means you're paying several multiples of what an equivalent account with Linode would be.

http://www.rackspace.com/cloud/cloud_hosting_products/server... " In addition to the hourly service fee of 12¢/hour per server, a $100 flat, monthly account fee will be assessed when at least one server on the account is active. The account fee is not reflected in the above pricing as it is not a per server charge but an overall account fee no matter how many servers are active on the account."