[kaolinite]

You might want to look into this: http://www.lumobodytech.com/lumo-lift/

I haven't tried one myself, although I am tempted as I often get quite bad back pain (at age 23 :-/ ), however I can't quite bring myself to add yet another device to my life that needs looking after, charging, etc.

However, I wonder if you can solve this problem purely with software. Could an app detect slouching by monitoring the user through the webcam?

[kingmanaz]

Amazing. That seems to be almost exactly what I was thinking of. I would think that the sensor would need to be on one's head, though, particularly if one is trying to achieve the "poise" I was speaking of.

>I can't quite bring myself to add yet another device to my life that needs looking after, charging, etc.

I'm with you there, however, having scoliosis, it's nearly impossible to tell when the posture's going "adrift". The Lumo smartphone integration is a turnoff, but if the device is otherwise simple I might just pick one up.