Greg Sterling is a local SEO with a lot of knowledge, an ability to write heaps of quality content and some good stories on local search to boot.
First things first: Greg is the man behind Screenwerk.com. (Which for some reason he's hardly optimizing? Edit: Correction, he's optimizing Gesterling.wordpress.com just fine but Screenwerk.com is the professional address of the site - just like Montreal SEO .ca for this one. The screenwerk domain gets you slow loading times though, Greg, and is possibly inhibiting less savvy people linking at your individual posts, imho.). It's a great blog with a variety of excellent information on local search marketing (this one on Yodle and co. competing with the Yellow Pages is a pretty good one, imho)
Second, Greg's got some fascinating data up on the percentage of people using local search, according to Nielsen. He's added further analysis at his Locals Only column at SEL. One highlight: 86% of people said they used the Web to find a local business, vs last year's 70%, and 78% say they use it more today than they did before. By contrast, 52% of people use the Yellow Pages less, according to the same data. (Looks like a bright future ahead for Yodle et cie.)
Finally, it's occurred to me that Greg has mastered something that we don't get to see very study in internet marketing - story telling. And I'm not talking about "Let me tell you the story of how I made $10,583 in one day" stories either. I mean stories like you'd read in the local business press. Consider this story on mothers, social media and their influence in the East Bay Area. Or consider this most recent post on a coffee shop telling members of the social media site Yelp to keep away. It makes the whole thing a lot more interesting than when you just read about a social media site or about generic data.
10 points on the originality and quality of your local search content, Greg!