I'm not sure I agree completely with Brent Ozar's advice at Building Your Blogging Momentum, but I like most of it. It seems aimed more for someone looking to raise their profile and not necessarily the average guy, but that's OK. There are lots of people that want an MVP or want to become more well known.
It's what I talk about. Building your brand and making a case for why you're a better employee. Blogging is a great way to do it, and while I know not everyone is a writer, in the IT world, we all need to communicate. Blogging is a good way to build that skill.
And show what you're working on, learning, etc.