A note on our expert: Miriam Ponzi, whose father Tom Ponzi, a famous private investigator, has always been on the cutting edge of technology. "I grew up playing with gadgets," she says. Ponzi now runs Tomponzi investigations, an international outfit with over 2,000 employees. She is a fan of PDA-phones. "Their two-in-one capacity is irresistible," she tells us. Her profession sometimes requires more devious communications equipment, which she didn’t tell us much about; suffice to say, she’s "always in search of the latest infernal gadget."