Yeah, that's been happening on Curious Reef a lot (Curious Reef is my website which is similar to OpenStudy).
Here's an example of people working through an issue in a C programming class: http://curiousreef.com/class/programming-in-c/lesson/1/assgn.... There wasn't any issue with the actual book itself, but the discussion is adding value to others who might come across the same problems.
(And perhaps also in better explaining the material by adding notes and linking to external content.)