What are some alternatives?
When comparing Linode and Rackspace, you can also consider the following products
DigitalOcean - Simplifying cloud hosting. Deploy an SSD cloud server in 55 seconds.
Vultr - VULTR Global Cloud Hosting - Brilliantly Fast SSD VPS Cloud Servers. 100% KVM Virtualization
000webhost - Zero cost website hosting with PHP, MySQL, Cpanel & no ads!
Microsoft Azure - Windows Azure and SQL Azure enable you to build, host and scale applications in Microsoft datacenters.
AWS - Amazon Web Services offers reliable, scalable, and inexpensive cloud computing services. Free to join, pay only for what you use.
Heroku - Agile deployment platform for Ruby, Node.js, Clojure, Java, Python, and Scala. Setup takes only minutes and deploys are instant through git. Leave tedious server maintenance to Heroku and focus on your code.