New York venture capitalist Steve Brotman argues that every start-up CEO should carry a Blackberry for responding quickly to partners and customers. Quite frankly, he says, "not carrying a Blackberry is stupid." By some estimates, a Blackberry ("the essential CEO tool") could save a high-priced executive close to 40 hours a month. The productivity argument is so compelling, says Brotman, that he's "contemplated making all our CEOs carry a Blackberry as part of our term sheet, no joke."