Better watch your back, Jack. Smartphone-payment player Intuit has formed an unholy alliance with AT&T to produce Intuit GoPayment for AT&T (these guys love the sound of their own names) in the hope of muscling in on Square's burgeoning smartphone mobile payments game. Time and money-poor small business people just need to insert the reader into the headphone socket of their phone (or tablet) and fire up the app. The partnership is offering faster deposits, no monthly service