If you've ever wondered if broccoli has a double c or a double l, what country Tanzania used to be (answer: not one country but two), or whether that word you're thinking of ends in -able or -ible, this is the book for you. (Yes, I know, this gives you a glimpse into the minutiae that I regard as interesting and exciting...)
Though it's mostly just a dictionary, you do also get a bit of the Bryson humour thrown in, e.g. under the entry "frisson", he says: "'A slight frisson went through the nation yesterday' (The Times). There is no other kind of frisson than a slight one."
He's also very entertaining in Mother Tongue, a book about the English language and how it developed. I particularly remember the section on Australian English and the reference to the "meteorological term" sconna, as in sconna rain.
I'm reading Eats Shoots & Leaves the zero tolerance approach to punctuation by Lynne Truss. It is a very humourous guide to the complications of English grammar.