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The best adaptor I have seen for the esp-01 is a chunk of IDE/ATA cable ribbon connector with 90 degree header pins soldered to it...

http://imgur.com/a/GGvUO

You can also use this $0.95 adapter from Adafruit: https://www.adafruit.com/products/2102 (although it doesn't include power and the other niceties)
I have a bag of those. They're great for soldering onto perf board, but they pop right out of regular breadboards.
Drat. Mine haven't actually arrived yet, but I had read that they worked. Oh well...