For those with older kids, gifted kids, homeschool kids, this looks like a marvelous site! It covers topics in history, literature, poetry, and even has book clubs.
There’s analyses, essay questions, how-to’s on writing, audio, video, fast facts, and hot topics. I just read sections on To Kill A Mockingbird and was quite impressed. I wish I’d had Shmoop as a resource when my son and I were reading the book.