I've also browsed the App Store for some biking apps. Motion-X seems to be pretty nice, but they don't focus on bikers. I doubt that you can do wind-speed measurement, etc. with the iPhone.. Maybe with 3.0 when they allow generic bluetooth devices to be coupled (however, they haven't even committed to that). I also saw another App for biking, "B.iCycle", which goes for 9.99 and that's why I haven't bought it yet. From the screenshots, they seem to be more of a biking computer than Motion-X. Have you tested that B.iCycle App yet? I would want to buy it, but two reviews are just too little for ten bucks IMHO. I've opened another thread and asked the others what they think..