I've had a lot of fun playing with Strava. This week, I happened to be at Portland International Raceway (on business, without my bike) at the same time as the Oregon Bicycle Racing Association folks were racing... and I got the idea of logging a quick "ride" so I could see their flyby data.
I got even more data than I expected... at least 64 different racers were logging their rides that night. I can play back the races and see their speeds and their lap/segment times, and in many cases I can see data from their heart rate monitors, power meters, and/or cadence sensors. I can see which riders set new personal records. From that, I can easily see that the final lap is generally the fastest one for most racers. I might go back and look closer to see just how much faster. Anyhow, they're all a lot faster than me... though I'm improving.
In this overview screenshot, you can see that one race was wrapping up as another one was starting, thus there were two distinct pelotons. (I've got the traces and icons for more than half the riders turned off.) It's fun thing is to hit the "play" button and watch the commotion in this view as half the racers pull into the paddock and later when riders go their separate ways.