Nothing, really. It's a pretty easy class.

At the university I went to, there was actually a prerequisite to the Freshman Computer Science course: A Logic for Computer Programming course, which was actually in the philosophy department. I really liked the course; it got me interested in further study of logic. I can't say it really helped in an applied sense, however (also, from what I heard, the course has a 60% fail rate).

But the only real preparation you need is to be familiar with computers, which I imagine you already are. One thing I can recommend though, is to make sure you are familiar with command line Operating Systems. Know some of the basic commands for Unix and DOS and the like. They're not hard, and you can pop up your command prompt for your GUI OS to practice. Just knowing how to navigate through files and folders, how to more stuff and copy stuff, and how to use the command line text editors might save you some trouble, as programming courses I've taken through the years have usually required such actions at one point or another.

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