MP3 players have been married to digital cameras and cell phones, but Nike MP3Run by Philips with a Bluetooth pedometer is a match made for the athlete. A speed sensor, which attaches to your shoe, sends your distance and pace to the player's LCD display. A synthesized voice announces how you're doing when you press the feedback button or at regular intervals you program. There's even a strobe light to make night runners easier to spot. Lots of MP3 players outdistance the MP3Run on storage -- its 256MB flash memory can store about 60 MP3 songs -- but for runners who don't need to tote an entire music library, this is a winning workout companion. $299;