Even without knowledge of previous performance, computer-assisted course selection can be great. A friend of mine implemented a genetic algorithm (in Javascrip

Even without knowledge of previous performance, computer-assisted course selection can be great. A friend of mine implemented a genetic algorithm (in Javascript) that mutated possible timetables until it seemingly found the best combination of your chosen criteria. You could select things like "I like Professor X", "I don't want to have lectures on wednesday", "I don't want to get up before 9" and give the algorithm incentives/disincentives for specific lectures. Worked remarkably well.