Using a GPS receiver and a bike-mounted ultra-mobile PC running LabVIEW, the NI Cycling Team tracked rider progress live during a 150-mile bike ride from Houston to Austin, Texas. To make it more interesting they decided to give some prototype wireless devices (currently in development by NI R&D) a trial run by taking simple measurements on nearby riders. Check out the technical tutorial and images of the tracking in the NI Developer Zone Community.
Check out this cool video on the application here: