Going Mobile (Veen) -- "Each runner wears a tiny chip tied to a lace on their shoe. As they cross the starting line, their bib number is transmitted from the chip through a large sensor under a mat to the official time-keeping computer. That way, when the runners cross the sensor at the finish line, they get their specific time on the course, rather than the generic time since the start." (Comments: When I ran in the the Rock 'N Roll Half Marathon last September I had a chip. Good use of technology!)