I'm training for my first ever marathon and keeping track of my distances is not mandatory but interesting to me to track my progress. The Nike+ finally caught my eye once again and I had always resisted it cause I needed a Nano. Solved that problem, got a 2nd Gen Red 8gb Nano on eBay for $80 and now just have to get the Nike+ kit. I suppose I'll need a shoelace pocket and possibly an armband now too. I use Asics for running. I'm excited about this one.