I use a Garmin Edge 305 on my rides, so I happen to have my riding history since 2007 (plus a couple of centuries from '06 that I got from a friend). It's good to see how I'm progressing - so far I'm keeping up or improving this year - and I like to set some goals, the record keeps me on track. I don't get a lot of miles in, so I do try to ride hard on non-commuting trips, just to make the most use of the time. I use SportTracks to manage the data, it's not bad.