I have spent a lot of time romping around the wilds of Baja, so I tend to go
overboard, but here is some of what I carry (in addition to the stuff you
listed):

A metric sockets, combination wrenches, brake spoon, and pliers wrapped up
in a couple of Sears Craftsman vinyl pouches with Velcro straps (available
at sears for about $6 each)
"Breaker bar" or leverage extender.  (Fancy name for a piece of steel pipe
that slides over hte handle of a socket wrench)
Spare belts
A wiring kit including fuses, lengths of various guage wires,solderless
connectors, spare bulbs, test leads, and a small circuit tester (this is a
hold-over from my days with British cars)
A REAL first aid kit, inlcuding some heavy duty prescription pain killers
and suture kits for severe emergencies when way off the beaten path.
"Marine Goop" and JB Weld
Spare wiper blade
Assortment of hose clamps
Assortment of metric nuts, washers, and bolts
Adhesive-backed velcro (comes in very handy some times)
Small water purifier (MSR unit)
Extra can of propane
Engine rebuild-in-a-can (just in case I blow the engine and can't get it
towed to the dealer)

Brent Christensen
'89 GL Syncro Westy "Klaus"
Santa Barbara, CA

PS - just kidding about the rebuild-in-a-can...