Magazine newsstand sales were revealed last week by the Audit Bureau of Circulations and the numbers were bleak. Editors are desperate to engage the younger generation — those tweeters, Facebookers, text messagers, and Web surfers who will ensure that titles have a future beyond the baby boomers. But what do they have to offer this prized demographic? More pictures of Lady Gaga or Kim Kardashian? Been there, done that.