RackSpace provides Free Web Based Training & Certification called "CloudU"

The following 10 lessons make up the CloudU Curriculum. This curriculum, just like university, starts off with the basics and gets more advanced as it progresses. Each lesson is accompanied by a quiz, but don’t worry–if you read the lesson whitepaper, you won’t have any trouble passing with flying colors. Even if you don’t register for CloudU so that you can earn the Certificate, you can still read and watch all the materials.
So what are you waiting for? Starting learning about the cloud today!

CloudU Lessons

http://cloudu.rackspace.com/diweb/start;jsessionid=2F4FD0A7E97C2955724574A00B8BD8CB.worker1

Signup for free account -> sign in with new a/c -> left side quick links (click on CloudU Curriculam)
-> Click Launch for getting into course -> complete it for Free Cloud Certification

What is OpenStack?

OpenStack is a cloud computing software project founded by Rackspace and NASA in 2010 and open sourced under the terms of the Apache License. The mission of the OpenStack project is to enable any organization to create and offer cloud computing services running on standard hardware. Currently more than 150 companies have joined the project among which are AMD, Intel, Canonical, SUSE Linux, Cisco, Dell, and HP.