I agree with @Jeff except I have a harder stance on it. As I've mentioned before I think that questions that are answered in standard undergraduate texts should be off-topic or discouraged here. I don't think we should introduce a homework tag... at least not until after we build a strong research community. Since advertising to typical undergraduates is likely to generate homework-level questions, then we should avoid it.
The (much smaller) university demographic that we should target it graduate students and professors. Professors are often a hard demographic to encourage, but graduate students shouldn't be as difficult.
If we want to reach these groups, then one of the things we should consider is advertising at CogSci2012. IIRC cstheory.SE won over academics by advertising at theory conferences. I would offer my services, but I am not that familiar with the cogsci community, and I am not sending papers this year (Japan is a bit far to travel for me).