If you were Panasonic and had already whittled a 12-inch laptop down to three pounds while keeping the optical drive in tact, what would your next move be? If you guessed make it manilla envelope-thin, you’d be wrong. The outfit just announced the Toughbook S10, and while it looks awfully similar to the three-pound S9 it’s replacing, it ushers in a series of welcome (and predictable) changes on the inside. This time around, it steps up to a Sandy Bridge Core i5-2520M processor, 4GB of RAM, USB 3.0, and a battery that promises up to 12.5 hours of juice — the longest in its class, [...]