Fans of the fresh, fast burrito that made Chipotle famous felt neglected until recently: Chipotle hadn't updated its iPhone app since 2009. A new app, released in March, lets users order and pay for custom tacos and burritos, sure, but the app is more notable for what it doesn't do. It doesn't ask you to link friends, turn over your email address or sign up for instant mobile coupons. In other words, no clutter. The restaurant also accepts orders by fax. Quaint but efficient.