I use the Nike+ system on my runs. I have a sensor on my shoe which connects to my Shuffle. As I run, it keeps track of my speed, my distance run and distance yet to run. I have a very pleasant woman talk to me during my runs who tells me how I'm doing. (I tried the guy's voice once but he wasn't nearly as encouraging as the woman).
Normally I am content to just run a solid, steady pace and call it a day. I've put myself on a new training plan which calls for different kinds of runs for different days. This plan calls for some short fast runs interspersed with my long, steady runs. Since I don't usually run anything at my near max. ability, my "voices in my head" are quite pleased with me. I'm getting constant encouragements lately on how fast I've run my distance and how many miles I'm accumulating.
Some people look at me a little concerned when I tell them the voices in my head motivate me to run longer and run faster. I'm just thankful for my faceless friends who keep me going and let me know when I've done an exceptional job. (Sssh, not now - I'm not running now!). Sorry. Sometimes they show up at the most inopportune time! A.