Shopped for a rugged laptop of late? If so, you've probably become overwhelmed with grief, likely due to the fact that 99.95 percent of them are both a) huge and b) unsightly. GammaTech's got a better idea: craft a rugged, shock-proof lappie that actually looks like every other 15.6-inch laptop on the market. Fancy that! The outfit's new Durabook S15C is its latest in a long line of field-tested machines, with this guy using a magnesium alloy case that's 20 times stronger than ABS plastic. We're told that it's tested to Mil-Standard 810G for drop and shock resistance, a