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I take two, and a patch kit.
I listen for the hole first, and that way always find it. Pump up the tube real good, and you're bound to hear it when you run it along your head/ear.
Another way is to look for the sharp object in the tyre. If you lined up the logos of your tyre with your valve stem, you can sometimes find the hole in the tube that way. Plus it looks nice!
If the puncture is too small to find it, it's probably small enough to make it to a shop with intermittent pumping.
Tijs
How many spare tubes do people tend to carry when touring?
What would you do if you got a puncture, didn't have a spare tube left, and couldn't find the hole (don't have access to water etc.)?