Writing Microcopy - Bokardo
http://bokardo.com/archives/writing-microcopy/

"Microcopy is small yet powerful copy. It’s fast, light, and deadly. It’s a short sentence, a phrase, a few words. A single word. It’s the small copy that has the biggest impact. Don’t judge it on its size…judge it on its effectiveness."

Microcopy counts

The fastest way to improve your interface is to improve your copy-writing.