Yahoo has begun to distribute an iPad magazine that illuminates the internet company\'s ambitions and the chronic troubles that have thrown its fate into doubt. The free magazine, called Livestand, has intriguing potential because its software can be customised to pull a deep pool of content from Yahoo\'s website and other participating publishers to cater to each user\'s interests. Since its launch last year, the iPad has thrust tablet computers onto the cutting edge of both technology and media. Yahoo is counting on Livestand to keep its brand and services relevant as more people embrace the iPad and other mobile devices to consume digital content.