This is my first year in a Materials Science & Engineering program. Overall I'm having a decent time getting situated in my work, adjusting to graduate life, and tackling different parts of projects that my lab is focused on in an effort to nail down a good thesis topic. However, my first semester and a half has exposed a glaring flaw in my knowledge: the ability to understand and manipulate complicated mathematical equations. (Differential equations, mostly, but also having a few problems understanding some of the formalities of integrals and how they can be manipulated.) I have no problems understanding most of the material in my field, and most of the time reading recent research isn't hazardous. However, there are times where I feel completely dumbfounded with some of the math concepts.
To combat this, over the summer I'd like to spend a lot of time working on these skills. What are some excellent sources on engineering-oriented mathematics, whether books or online sources? I was considering getting "Essential Mathematical Methods for the Physical Sciences" when it's published in the US and using some of the lectures on Academic Earth, but I would love to hear what other peoples' opinions are. Fire away!