I have a fair amount of 'regular' tools, mainly for automotive stuff, but in addition to the things posted above, I have used the following: hammer, flathead screwdrivers, large (10" or larger) sliding adjustable wrench, vise-grips, large syringes (for grease/lube), and rubber mallet.

Most of the time my rides are just commuting, so I only carry a multi-tool and 15mm combi wrench. I'll just walk by the coop or the LBS if I break a chain.