My favourite book review search site

It's Tango.
That is of course if you know how to use it right.
The search engine covers everything, absolutely everything, from review-like opinions signed ancient Greek philosophers of their contemporary letter masters to the latest reviews of Precious and even anticipatory reviews of books that has not been officially published yet.

Typical example:

"No books. No writing. No drills. And nothing to
memorize—ever!

With his unique program, Michelle Jones has taught tango in French, Italian,
Spanish, and German to celebrities, corporate leaders, and school childrenwith
immediate and amazing results. Now, the Dance Teacher to the Stars invites you
to join his class!

So effortless, natural, and stimulating is Michelle's system for learning, once you get started you won't want to stop. You will learn in realtime—fully understanding as you go along, turning words into short sentences, steps into moves, and then building them into longer, more complex swirls, until you are tangoing in a foreign language. Immediately, you will feel the excitement of understanding and expressing yourself in tango in Germany or south France. Michelle will have you
formulating your own thoughts and moves from the very beginning, even if you
have never succeeded in learning a single dance before."