For running anyway!
My Garmin Forerunner 305, which is actually not even mine. I got it for Mitch for Christmas but I think I use it more than he does! Great for tracking distance, time and pace. It has other cool features too but that's mostly what I use it for. So nice not to have to drive out my route first to figure out how far I'm going!
Pink Spibelt! I didn't think I'd like it at first, but this thing holds my iphone plus anything else I want to carry. I wish it was waterproof but I just put things in a ziplock bag and it's all good.