Some of the classes here are using MyLabs from Pearson. It is an online learning management system that accompanies some of their textbooks. It can be a little tricky to get started (help documents here), but can minimize the amount of homework the teacher has to grade while simultaneously giving students more practice and explanation. Simply put: it seems to be a win-win.
Michelle Scholz and I will be working on a project to more closely review such online components. We will be presenting our findings at the CALICO conference in May. It will be interesting to see exactly what these types of programs have to offer. Computer-graded homework is nice, but we will look at the pedagogical approach, design, and technology more closely. Until then, enjoy the little bit of extra free time MyLabs provides.