Dave Knox has one of the more interesting blogs out there right now for a number of reasons:
1. He's a client. He's in the midst of transitioning from a job on the P&G Wal-Mart Customer Team to a job at Procter & Gamble proper (in Cincinnati) where he'll help boost their social media practice. As such, he looks at things from a different perspective than many of the advertising focused bloggers.
2. He's a midwesterner, born and bred in Cincinnati (or thereabouts) and as such, has not fallen victim to the NASCAR Blindness that afflicts so many in the ad community.
3. He's a smart guy and good writer who makes it a point to keep up on everything that's going on in the world of social media. I've learned a lot from his blog and his tweets.
If you're looking to expand your perspective beyond the same old/same old, then definitely check out his blog Hard Knox Life.