Now that Renderman is available for free for non-commercial use, there were many requests for an integration with Blender. And guess what? An initiative spearheaded by Pixar now presents the first Blender to Renderman plugin!
With the release of PRMan 20, a small group of developers headed by Brian Savery of Pixar have been working on support for using Renderman and Blender together. This plugin is still in early alpha but has had many great developments in the last few weeks. If you are interested in harnessing the power of Blender and Renderman this plugin is for you.