Annually: Brake Fluid, Battery Electrolyte (non-maintenance-free types),
Every other year: Coolant change, Complete empty/refill of gas tank (get the water/crud out), Steering Head Bearing Clean/Lubricate, Fork Oil/Fluid
On Mileage: Oil AND filter, Fuel Filters every 12-24K (closer to 12K doesn't hurt)
On Condition: Tires, Brakes, and Chain/Sprocket sets, Cables (throttle and if applicable clutch)
RE: Brake pads - if there's less than a 'dime' (i.e. depth of material) worth of pad left, change them IMMEDIATELY.
YMMV...