Diagrams/Infographics for learning about Computer Science/Programming [closed]

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A few friends and I are doing a self-study on Computer Science/Programming and taking the Computer Science AP A exam. Although I have experience in programming in a few languages, it's still difficult for me to explain some concepts such as OOP and memory management.

Are there are interesting diagrams or infographics that could explain these things?

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I like the course material that MIT puts online for free, the video lectures in the intro-cs class should be useful.

http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/