The Tuxedo [http://en.wikipedia.org/wiki/The_Tuxedo].
It's useful in this world, great for all practical applications, looks snazzy, and does everything I could want it to do. Parkour in dinner-wear, no sweat, never get tired?
The inner Star Wars fanboy commands me to say Lightsabre.
Although, if I actually had to choose one, I'd take the technology the Culture have which allows people to alter their genes, and as a result have minutes-long orgasms.
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