Just some tools that spring to my mind:
-adjustable spanner (called a "Frenchman" round here), big enough to tackle axle nuts
-2(!) 10mm spanners
-12,14mm spanners
-feeler gauge
-allen keys
-a good knife
-electric stuff like wire, tape, connecting shoes
-clutch/gas cable and repair nipples
I'm seriously considering one of those multi tools. I always had the opinion that a Leatherman is a Yuppie tool, not to be used but only for display and never, never a replacement for proper tools. At least the knife is crap and can't replace a proper one-hander.
Now I'm considering the last generation of the Victorinox swiss tool, which now not only has a set of bits, but also a small ratchet. Something for Xmas- I should plant the seed with the family
Cheers, Remi