I enjoyed this book very much. It's a pretty entertaining account of various aspects of the history of the English language. It's written in Bill Bryson's dry, wry style, which makes it a quick and easy read. Full of fascinating tidbits about language.
Since reading it, however, I've learned that at least some of Bryson's tidbits aren't necessarily accurate, particularly when he makes some pretty sweeping comparisons between English and other human languages.
I still recommend it if you have any interest in the history of English; it's a fascinating introduction to the study of language. Just take it with a grain of salt.