I can't figure out if this is a good idea, or if it's something created to capitalize on hyper safety-conscious new parents. A South African company has recently developed the RespiSense - a small device that when put in a baby's diaper monitors breathing patterns. Then, if the monitor detects a 15 second pause in breathing, it will vibrate to stimulate the baby back into breathing. The claim is it will help to prevent "cot death" or as we call it, SIDS.
Their web site doesn't have any data on it's efficacy, or even a single testimonial from anyone in the medical field. Apparently they are beginning real testing now, but I'm surprised that they can sell it at all (I guess the rules in South Africa are different than here in the US). It will be interesting to see the results.