Thanks to everyone for the info. After looking around, and given that I'm not quite yet ready to pop for a nice GPS or mobile device, I think I'm just going to get a cheapy wired computer for my current mileage tracking needs and go for either an iPhone of an Android when my bank account rebounds from my LHT purchase.

BTW, really love the LHT. I got it with big ol' Salsa Woodchipper bars and a stem extender for a very comfortable ride. Oh, and a Brooks saddle, which I'd been warned takes a while to break in, but felt good right out of the gate.