Introduction to Machine Learning: Everything You Need to Know

This presentation from Hilary Mason at devs love bacon in April, titled "Everything You Need to know about Machine Learning in 30 Minutes or Less," is an introduction to machine learning for those who have no prior experience with it. Take a look if you're interested in a quick, fun overview to help you get started:

Hilary Mason - Machine Learning for Hackers from BACON: things developers love on Vimeo.

Then, if you want to get a bit deeper, check out this intro to machine learning in R, or to get a lot deeper, our Machine Learning Refcard.