14 Hours of professional training videos and support files directly from Side FX themselves, covering every major aspect of the software, modeling, rigging, animation, texturing, shading, rendering, compositing, and effects, and include support materials:
Free Online class with Video Lectures, tests, assignments and projects. Currently there is 1 module (approximately 4 Hours worth of video lectures) available, with a second module (hours more of video) on the way in a matter of days, and new modules to follow approximately once a month.
You can download the software from either within the Houdini 101 Course at Buzz, or at the VisLab site linked above.
These videos are narrated and very informative, and it's all free. Take advantage of it.