Not all Panasonic Toughbooks are big briefcases, made to withstand the worst that nature has to throw at them. The company also manufactures a series of business-rugged Toughbooks--some of the lightest in the world and just as tough--to meet the demands of corporate and consumer folks who take their computing on the road. <A HREF="http://www.eweek.com/article2/0,1895,2216278,00.asp?kc=EWKNLEDP111407B">Panasonic announced three additions to its ultraportable line,</A> the W7, the Y7 and the T7 tablet, with some necessary internal upgrades.