A sears catalog with the store on speed dial.

More seriously- Not in any particular order.

A hammer assortment.
Several different sets of pliers, locking, side cutters, channel locks, needle nose pliers.
Cresent wrenches in at least two sizes.
A socket set with extensions.
Open/box wrenches.
Screwdrivers- at least one each in two sizes.
Chain breaker.
Air compressor.
Chemical assortment.
Tire tools.
Sandpaper assortment.
Ex-acto knives.
Dremel set.
Good sturdy work bench(es).
Bike stand.
Radio/CD player.

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If it ain't broke, and you mess with it long enough, it will be.