Either aLapRecorderHD or Trackmaster.
aLapRecorderHD lets you record video at the same time, trackmaster is better overall BUT it won't start recording until you hit the first timing point .
Not yet. I accidentally left the GoPro on after go karting so the battery went flat, and I haven't got around to charging it yet. And I was too lazy to set the phone up for Happy Laps .
Will put the go karting videos up as soon as I can.