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I would look at the syllabus that a sophomore-level computer science class would use, which when I took it was called something like Data Structures and Program Design. Take a look at the books taught at places with good CS departments (like Stanford, CMU, and MIT), and see what ones are most popular. Also a syllabus may have example problems, lecture notes, and previous exams.

After doing a little research, MIT OpenCourseWare seems to be really good. So much for doing homework this weekend!

iTunes U is an amazing resource for learning these days. So many courses and lectures and homework assignments. And Khan academy has a pretty good CS section as well.