You're intelligent enough to know that carrying around a Cell Phone and a PDA is inefficient. Lighten your load by picking up an all-in-one device. Whether you use it as an organizer, an e-mail device, a cell phone, or all of the above, getting a smartphone is a smart move. See our top five picks for these phone-PDA hybrids; we've picked one for each major carrier, as well as one unlocked smartphone.