Tossing a pair of GPUs into a single, beastly laptop ain't nothing new -- in fact, Alienware's own M17x has been offered in such a way since last year -- but having said machine arrive at your doorstep with a pair of ATI's world-beating Mobility Radeon HD 5870s has been downright impossible until now. The earliest of adopters are now reporting (with ear-to-ear grins, to boot) that their dual 1GB HD 5870-equipped M17x machines are finally shipping, and we