I stumbled upon a discussion regarding the new Red Hot Chili Pepper song "Dani California". I don't know how I missed this, but the tune is identical to Tom Petty's "Mary Jane’s Last Dance".
Go ahead and play the two songs in your head. Or better yet, listen to this MP3. I'm sure the Peppers weren't ripping off Petty intentionally, but it's a definite copy. It's like Crazy Town's "Butterfly" vs. "Pretty Little Ditty" without the credit.