If you can get heating, ventilation, and air conditioning (HVAC) techs to play, your approach might be working. The Air Conditioning Contractors of America (ACCA) have been blogging since 2004, and with attention-getting results (WSJ gave the blog a nod as exemplary for its diverse daily content and breezy style). www.accabuzz.com

Proving you can’t be too ephemeral or obscure, here’s a well-executed blog celebrating the impulse to tinker, putter, and otherwise noodle with any and all things mechanical. www.finkbuilt.com/blog

Laden with irony is the posting “Circular Saw Blunders in 3-D,” from a 1953 edition of Popular Science. It even includes the glasses. Did that exemplify that era’s concept of audience interaction? What ensures that blogs don’t suffer the same fate as red-and-green-lensed cardboard glasses?