If the Desire HD is HTC's uber-multimedia phone, the HTC Desire Z is their business monster. We've been asking the company to produce a new hardware QWERTY device for twelve months now, and they've certainly delivered: the Desire Z's 'board is finger-friendly, snappy and slotted into a handset that still manages to be pocketable. As with the Desire HD, construction is rock-solid – though the "Z Hi