http://sellout.woot.com/ for today (10/11/2011) is the WinPlus Beacon GPS Tracker. It's an "after-the-fact" GPS logging system that lets you see where you've been. It's perfect for logging the position, speed, and altitude of your ride. Think of it as a GPS capture device kind of like the GoPro is the HD capture device.
I just ordered one so will let you know how well it works.