Yellow button on LHS is PTT (Push To Talk) for UHF radio. Both are connected into the Starcom Digital comms system under the seat. The Zumo 660 is also connected in and it acts also as an MP3 player.
The socket you can see in the top LHS of the dash (just to the right in the pic of the UHF radio's on/off dial) is where I plug my helmet audio wiring into the Starcom. The toggle switch, barely visible under the RHS upper dash above the warning lights, is the spotlight isolation switch.
The buttons on the RHS are the Oxford heated grips control unit. I had the Honda OEM heated grips on my first ST1300 but they have fiddly wires that tore out twice. So when I bought this newer ST and it didn't have heated grips, and I'd heard such good reports on the Oxford gear (I have an Oxford magnetic tank bag I love), I looked at their grips. the Oxford grips are slightly larger diameter, which I like, but the wiring and whole setup is really robust. I haven't really tested the hot grips yet as Winter in Brissy hasn't hit yet. I could have done with them at Cradle Mountain in early March though!!