Point me to an F/OSS and Open Hardware version and I'm there. Seriously, I'm always backing those sorts of devices over proprietary ones every chance I get - though it's rare as heck.

Pretty sure this is still under active development, but it's supposed to be a completely open fitness tracker: http://openhealth.wemaketotem.org/

There's also the FOSS smart watch OS Asteroid OS: http://asteroidos.org/

Thanks! Not sure that the tracker is what I'm looking for (or I'd be into the fitbit move), but Asteroid looks intriguing. I'm following both now.

Appreciate the tip!