David Crystal has an interesting book coming out this fall called "TXTNG." It deals with the topic of this increasingly popular form of communicating: texting. Now, while I can't imagine anyone writing a business book in texting language (except maybe Dan Pink), I do think that communication is important for writers to understand - in terms of how people, especially young people, are receptive to information, and how they'll spread what they know.
Here's a blurb from the publisher, Oxford University Press:
"Do young people text as much as people think? Do adults? Does texting spell the end of literacy? Is there a panic in the media? David Crystal looks at the evidence. He investigates how texting began and who uses it, why and what for. He shows how to interpret its mix of pictograms, logograms, abbreviations, symbols, and wordplay, and how it works in different languages. He explores the ways similar devices have been used in different eras and discovers that the texting system of conveying sounds and meaning goes back a long way, all the way in fact to the origins of writing - and he concludes that far from hindering literacy, texting may turn out to help it."