NASA has teamed up with Rackspace to announce a new project called OpenStack with the goal of allowing any organization to create and offer cloud computing capabilities using Open Source Software running on standard hardware.  Ryan Paul's recent blog on the state of this development is a great place to catch up on where NASA may be heading with this.  With the number of big names involved in the OpenStack project, it's hard to see this not taking off.  Check out this great 5-minute overview of OpenStack, or you can check out the code available on LaunchPad.