For many brands, a blog is an essential component of their overall marketing mix. It's a tool that enables them to engage with customers on a conversational level between purchases, reach new audiences with compelling stories and service-driven info, establish the company as an industry trendsetter, and--ultimately--generate leads and drive sales. That said, creating a blog that stays true to your brand values while attracting a loyal audience can be a tricky balance. We've talked about how to kill perfectly good content, and what mistakes to avoid. But when it comes to killing it with blog content, there are lessons to be learned from the best--and we're not just talking about companies who have millions to spend on content marketing. While they differ in services, scale, and style, the five brands included here have set new standards for developing meaningful relationships with customers through highly relevant content. Check out how these companies are using their blogs to achieve their business goals--and build a loyal customer base for life.