A person known to me only as Unscrewed once noticed that the following description:
A young wizard named Harry finds himself an orphan because of the machinations of a would-be evil overlord. His adoptive parents are cruel and neglectful. However, he learns his most important lessons (those of the heart) from a old, kind, and powerful wizard. He fights a variety of magical opponents, has a definite disrespect for authority, and suffers scorn from his peers. He eventually defeats the evil overlord, but finds the kind old wizard he respected so much wasn't as perfect as he originally seemed.
perfectly describes both Harry Potter books (which are extremely profitable) and The Dresden Files books (which have a cult following).
Clearly, this can't be a coincidence. Stories centered around orphaned wizards named Harry must innately call to something deep in the current zeitgeist, and there's bound to be a public some public domain work along these lines that I can exploit to become filthy rich and/or popular.
So, on a completely unrelated note, a question: what is the earliest story that features a magic-using named Harry? Bonus points if he's also an orphan.