[mrborgen]

Haven taken this course (though I will), but check out Andrew Ng's Coursera's ML course. He gives a crash course in linear algebra. It helped me a lot in my endeavours in ML & neural nets. I also like to learn as I go along, and this intro was just about enough to get started.

[pramodliv1]

I did not find the crash course in Linear Algebra to be useful. I had to complete Strang's course (ocw.mit.edu/courses/mathematics/18-06-linear-algebra-spring-2010/video-lectures/) before doing Andrew Ng's course , after which most of the course seemed easy.

[aswanson]

Ng is an awesome lecturer, very easy to follow.