Although WIRED is now claiming that blogs are dead, I'm not buying that. Maybe they're dead to a minuscule group of people who are easily bored and only talk in 140 character spurts, but if learning is reduced to tweets, I think we're in big trouble. It's that kind of short-term, surface discussion of issues that in my opinion has contributed to the current world-wide financial crisis we're in. Life is becoming more complicated, not less so, and Twitter comments and writing on someone's Facebook wall will not get us out of this mess. We need more sustained discussions and reflection, the kind that's supported by blogging.
This 1 1/2 minute video with Seth Godin and Tom Peters pretty much sums up my response for why blogging is important. Seth says that it's the meta-cognitive process of reflection on what you do and the humility of explaining yourself to an audience. Tom says that no single thing in the past 15 years has had such a profound impact on his professional development:
"It has changed my life, it has changed my perspective, it has changed my intellectual outlook, it has changed my emotional outlook--and, parentheses, it's the best damn marketing tool I've ever seen."
Plus, as Seth points out a few times, it's free.