I don't always agree with the choice of bad chess book covers collected by my fellow-blogger ejh; a couple I even almost like.
However, the following chess book cover has to be the very best ever (click to enlarge):
The ballsy swashbuckle of a Nxf7 sac, subtly blended with the sweaty glamour of disco. A rainbow of excitement beamed down at the chess board from the ceiling, like lazers from our sacrifice-loving eyes. How it reminds us all once again of that old fundamental truth, that nothing is black and white in chess. It is like a dream I had, quite literally!
PS. This cover also impressed me.