So, what books do you think are great but get too little praise ("Under the Radar")? I am in the mood to buy a few!

Alex Yermolinsky' The Road To Chess Improvement is one you don't hear about a lot, but its supposed to be very good (probably will scoop it up sooner or later myself). 

There is a nice write up of it at chesscafe.com. 

I've just finished "Chess exam and training guide" by Igor Khmelnitsky, and it's simply the very best chess training book I've ever seen

He has written a sequel aimed at tactics training, but I haven't read it yet.

I really like the "Chess Exam and Training Guide" too.  It estimates your rating, highlights weaknesses and suggests ways to work on these weaknesses.

Nice suggestions! Keep'em comming!

Chess Master vs Chess Amateur - Max Euwe

In addition, I'd say that given all the attention to Logical Chess Move by Move, some of Chernev's other books are true gems yet often ignored. Specifically: The Most Instructive Games of Chess Ever Played; and The 1000 Best Short Games of Chess.

Agreed! Fine books!

Learn From the Grandmasters.  Very interesting (and instructive)--but I don't think I've ever heard anyone talk about it.

It might not be under the radar but Chess Praxis is often over shadowed by My System, and quite a few people have told me Chess Praxis is much better.

"Learn from the Grandmasters" was on sale in the UK earlier this year. I picked up a copy for a few GBP.

The Game of Chess by Tarrasch.  l am a chess coach for children and after they learn to play, The first part of this book "the Elements of Chess" is their transition to further learning.  I am amazed at the increase in their skills and tournament results this simple instruction seems to accomplish.  I know it was the bible for many generations of chess players; but no one mentions it anymore.

Theres also a book called "The chess players Bible", and Ibought it. Its awesome.

And (for that matter) I would recommend any collection of Tarrasch's games.  They are truly great--even though I often get the feeling that he's mainly remembered as the Guy Who Pissed Off Nimzovich.

endgame secrets by christopher lutz. With diagrams, variations etc, tis is one of the stronger books.

How to Defend in Chess by Colin Crouch

Pawn Structure Chess by Andrew Soltis

The Seven Deadly Chess Sins by Jonathon Rowson

Oh, and we can't forget GM RAM!

http://www.amazon.com/Gm-Ram-Essential-Grandmaster-Chess-Knowledge/dp/0938650726

http://jeremysilman.com/book_reviews_js/js_gm_ram_essential_grand.html