I use Strava on my commutes, which are about the only riding I'm doing nowadays. If I get to work a little faster than usual, it puts a smile on my face. If I'm a little slower, I can think about traffic or wind that day, or am I coming down with something <cough, cough>?

It's a nice tool if you like to keep track of things. If it didn't exist, I'd be fine with that, too.