A few years ago, the Wolfire team (AKA, the Humble Bundle originators), put together a great set of articles on linear algebra as it applies to game development. I think it's one of the most plainly-written and practical guides out there. I still mentally picture the diagrams when I've been out of the loop for a bit.

http://blog.wolfire.com/2009/07/linear-algebra-for-game-deve...