Ever since I was a wee girl with a first-generation iPod, a three-megapixel digicam, a clunky cellphone and a ginormous laptop (OK, I wasn't that wee--it was like four years ago), I've lusted after a gadget that could do everything and take up next to no space. I mean, wouldn't it be amazing to be able to shoot and store photos, surf the Web, check e-mails, and listen to music files on one device small enough to slide casually into a back pocket?