Oxford Spanish Verbpack

Other than my Oxford Spanish Dictionary, this book is my constant companion when working in Spanish. Originally, I used it to look up the meanings of verbs, but now, it's the tables at the back which get the most use. I've read better texts on Spanish verbs and tenses than the ones in the book, and the definitions are very basic (and often tell the reader to consult a dictionary - which is fair enough), but nowhere have I seen better tables. Works in either Peninsular or American Spanish. Indespensible.