If you're working today, you probably need an online video pick-me-up, rather than more stats, research or news on this fabulous and fast-growing sector of the digital ad economy. And what better form for said spirits-booster to come in than a cat video? As readers may know, cat videos are - paws down - my favorite Web videos. Plus, this one has an ad angle. The social media ad agency Big Fuel Communications, known for its work on behalf of Bravo, GM, Clorox and others, partnered with the Humane Society of NY to create a cat video calendar.