REDMOND, Wash.--Remember the CueCat--the quirky bar code reader that was going to connect magazine readers with digital material? Well, apparently Microsoft does too. And while the CueCat meowed into obscurity, the software maker thinks that the idea made sense--that is, using a digital scanner to link printed materials with online content. You can think of Microsoft Tag as CueCat 2.0, though this time, it doesn't require a special device. Instead, Microsoft tags use a cell phone camera for scanning the bar code, and the digital content can pop up right there on the phone. Over the past year, Microsoft tags have started showing up in magazines and newspapers. Tags can also be placed on business cards, products, and even large outdoor signs. "It's the hyperlink in the physical world," said Marja Koopmans, marketing leader for Microsoft's start-up accelerator unit. Tags can link to anything from a Web page to an online brochure or electronic business card (see video...