Well, here's the list of mods to our 2009 ST1300. Some may seem a bit odd but it's set up for our touring holidays -
Honda wind deflectors, full set
Maxton front revalve and springs, MCT modified stock rear shock
MCL bar risers
Tomtom Sat nav mounted on Migsel
Small compass mounted on Migsel, for areas not covered by sat-nav
ASV brake and clutch levers
RHS light control switchgear from a pre '04 Pan to allow me to turn my headlights off
McCruise control
All bulbs replaced with LED's
LED indicator repeaters in front mirror housing
LED replacement fuses
Voltage warning LED tri-colour light on R/H filler panel
PIAA 1100x lamps and BLM mounts
Steibel horn
Honda Police switches hidden inside RHS glove box for rear fog
Honda heated grips and quartet harness
Additional accessory harness
Power socket LHS glove box
Autocom comms for sat-nav and rider/pillion with IR-803 Radio - PMR446
Sonic PTT modded on Autocom wiring to operate PMR446
Sargent seat, rider and pillion
Pirates Lair pillion back rest
Stuff-stopper front mudguard extender
Bikequip Frame protectors
Bikequip tinted screen, taller and wider with a 'flip'
Bikequip rear shock protector
Bikequip black hi-viz reflector on rear of panniers, front of mirror housing & front apron under screen. Shows up white when hit by light.
Pannier inner bags
Baglux tank cover and bag
Turbo Tom Radiator guard
Ivans FCE to resolve the hair-trigger throttle
Needle roller head bearings
90 degree right-angle tyre valves
Changed from the silly plastic clip to an allen bolt to secure the inspection panel on the fairing - not a good description I know!
Mountings for Point Two air vests that we both wear
+ I'm booked in to get my dash lights modded this year and have the GPI added into the dash as well.
My favorites -
Suspension mods
Stuff stopper
Switchbacks for the front indicators.
Sargent seat.
Comfort, safety and keeping the bike clean works for me!
Seconded by my passenger. 
