Well, I think the majority of marketing writing is quite un-actionable. You read it, and it might sound good, but when you get out in the real world you really have no idea how actually implement it.
So the goal of Marketing Examples is to get as close to the "real world" as possible. The site is a collection of marketing tactics used by successful startups and the idea is that you can copy the techniques step-by-step.
Admittedly, I'm the founder, but I pour a lot into these examples and people say they're great, so I feel confident giving myself a 5*
Breaking - Short news in your Today tab for Mac and iOS
Starter Story - Learn how others are building successful e-commerce businesses.
Inside Drones - All the news about drones and UAVs, in your inbox twice/week
Good Sales Emails - Best sales emails from great companies
Nano Drone - One tiny ass quadcopter
Indie Hackers - Connect with fellow entrepreneurs, developers, and bootstrappers who are sharing the strategies and revenue numbers behind their companies.