Micro-electro-mechanical systems (MEMS) penetrated the mass market two decades ago, when they enabled air bags to trigger fast enough to catch passengers before they hit the steering wheel or windshield. MEMS chips gained a major business-market design-win a decade ago, when they began to be used to fabricate the high-precision ink-jet print-heads that displaced impact printers. Now, MEMS chips are entering the consumer-electronics mainstream with the same invigorating effect. Most recently, we're seeing MEMS technology being used in Nintendo's Wii and Apple's iPhone, and this may just be the beginning. The real volume customers will be the mainstream consumer-electronics makers adding MEMS chips to their ubiquitous devices.