I am always suspicious when people claim that a massively successful work rips off their work, mainly because human experience is limited and people tend to see connections that they want to see. I don't know if this woman is correct when she says that Jonathan Larsen plagiarized from her in writing Rent, but I do know that I would be more inclined to believe her if she were not such a complete ass in this piece in Slate.
( Here there be spoilers! )
( Here there be spoilers! )