The dual-mode DECT/GSM worn device seems like the only delivery platform that is guaranteed to exist and does every possible thing we need done for all Consumerium Services. The DECT blurbs even talk about barcode readers explicitly!!! So maybe it makes sense to focus design ideas on the use of this platform, and, figure out what subset of those features can be delivered with crappy existing crap like WiFi or GSM with Bluetooth?