http://www.cgforge.com/course?courseid=houdini-for-the-new-artist
http://www.cgforge.com/course?courseid=houdini-for-the-new-artist-ii
Houdini for The New Artist is perfect for anyone interested in learning Houdini for the first time.  To keep things interesting, we learn about the basics while building "Alfred the Rhino" from scratch.  If you're looking for an intro tutorial that gives you a bit of everything, fun to work with, and straight to the point - this is for you.
This course is designed to help you develop a strong foundation of skills within Houdini by covering a really wide variety of topics.  To do this, we'll be building the dragon transformation effect from scratch, and as we go along, new topics are  presented in a way that gradually builds upon your artistic and technical skill-sets.  By the end of this course, you're abilities will progress in a way which allows you to approach any Houdini topic with a lot more confidence.