Yup. It's the online version of Cliff's Notes basically. I actually don't mind students using Sparksnotes to supplement their reading, but unfortunately many use it to substitute for actually reading which doesn't work out well for them. I show them how to use it as a tool rather than a substitute. Cliff's Notes got me through some hairy literature in college. For instance, I talk about reading Beowulf in Middle English and not understand a blooming thing I was reading so I would use Cliff Notes to clarify and verify that I was on the right track.