From the post:
Once in a while I get questions like Where to start learning more on machine learning. Other than the official sources I think there is quite good coverage also in the Mahout community: Since it was founded several presentations have been given that give an overview of Apache Mahout, introduce special features or even go into more details on particular implementations. Below is an attempt to create a collection of talks given so far without any claim to contain links to all videos or lectures. Feel free to add your favourite in the comments section. In addition I linked to some online courses with further material to get you started.
When looking for books of course check out Mahout in Action. Also Taming Text and the data mining book that comes with weka are good starting points for practitioners.
Nice collection of resources on getting started with Apache Mahout.