We’ve been talking about touch a lot. On your smartphone and tablet. Your TouchSmart desktops…and more recently, laptops. Sometimes, though, a mouse is still the best way to get around your computer. For some, a mouse is still the quickest way to edit documents (or play StarCraft II). How about a barely-there mouse that looks so nice you’d actually want to have it sit on your desk – even when you’re not using it? That’s the HP Z4000.