I didn't expect much from this book, but I have to admit I was surprised by just how little it really was. Fits nicely in the palm of your hand, conceivably so you could carry it around with you for reference when deciphering the obscure text messages your friends send your cell phone.
It does a fair job of covering the usual abbreviations, shortcuts and acronyms, IMHO. The smileys are a bit of a stretch. I found it odd that standard ones appear multiple times with different descriptions. Felt like they were trying to fill the book.
In short, it's a cute little book that might make a nice gift for someone just getting into instant or text messaging. Don't expect to use it as a serious reference, though.