Oh, the calculus course that I'm TAing this semester is using WebAssign for certain homework assignments. It's a web-based system that lets the students see the homework problems on the screen, enter their answers, and immediately be told whether they're right or wrong, with a few chances to try again for the right answer. And it records all their scores so that they can be averaged into their final grade. (There are some problems that won't work with just entering an answer, so there are some written assignments, too, but a lot less grading than usual.)
I'm kind of iffy on this system. I can see both good and bad sides of it. Also, the design is horrible -- nothing is where you'd expect it to be.
But anyway. It costs something like $15 per semester for each student to use it. That's supposed to be included in the textbook price -- the textbook comes with a card with an access code. Judging by the number of "I can't find my access code" emails I've gotten today, I think the bookstore ordered the edition without the access code card.