I have only one, Adam Levine's Money Stuff. I don't think I'd be able to handle more newsletters though. I remember subscribing to too many in the past, and eventually filtering them all into the garbage or unsubscribing. As for why this one newsletter stuck, I think it's due to Levine's tone and enthusiasm for the material. And also due to how much garbage is out there when you try to find information on financial markets. It's nice to have a clear signal through the noise.