Speculation over an AT&T 3G-enabled MacBook fanned some flames in the Apple-minded blogosphere this week, as did Apple’s and IBM’s settlement over engineer Mark Papermaster. Also, most everyone seems pleased that Apple is finally letting iTunes customers upgrade their musical libraries one song at a time rather than all-at-once. Years ago, Apple jumped in bed with AT&T to offer exclusive cellular services to iPhone owners. Might the companies be considering a relationship more akin to marriage?