Privacy worries? Don't print in color. "You've got to love black-and-white laser printers. You can get a good one for $150 or so, and each toner cartridge cranks out thousands of pages before you need a refill. Best of all, they don't spy on you. You can't say the same about color laser printers, as we learned last week. Actually, we should have learned it nearly a year ago. That's when PC World magazine reported that makers of color laser printers, in cooperation with law enforcement agencies, have programmed their machines to print tiny yellow dots on every printed document. These dots are almost invisible under normal conditions, but can be spotted by anyone with a magnifier and the right sort of lighting. . ."