When my friend lets fly what she deems a particularly droll bon mot and it fails to get a big laugh from the room, she immediately tweets it out.

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Nevertheless, when Donaire lets his gloved fists fly he leaves himself open and his chin with a bull's eye on it.

WSJ: Radio City Fight Night

Waddle lets you create ad hoc groups on the fly.

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The company provides a variety of tour options, from a straightforward fly-in to a trip that lets you cross-country ski the last 20 kilometers (13.4 miles).

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Other services that might turn into revenue generators for wireless service providers include a function that lets customers find certain types of businesses on the fly.

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Ichoose of Dallas and other shops are developing ever-shrewder software that lets online merchants scan rival sites, adjust prices on the fly and steal customers, all without leaving a clue.

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This lets you exert less force when keying and, for typists who can really fly, eliminates the missing letters that result when the keyboard can't keep up with your fingers.

WSJ: Keys That Really Click

There's no minimum service, customers are allowed to change their plans on the fly, and there's even a handy parental control mode that lets concerned caretakers set curfews and app restrictions on their kid's phones.

ENGADGET

The FLY, for lack of a better description, is essentially a pen-based computer for kids that lets you write stuff down on paper and then interact with your drawings.

ENGADGET: LeapFrog's FLY pentop computer