A new favorite of mine is celebrating it's 50th year in print!
The Phantom Tollbooth by Norton Juster is such a delight to read that I purchased it and plan to read it again and again. For anyone who loves the English language, this book will be a winner for you. It's clever, tongue-in-cheek method of making its point is linguistic absurdity at its best. And I didn't make that up, NPR offered a piece on this milestone.
Listen to the show here, and pick up this book!