Glenn Flear's "Improve Your Endgame Play" is a good one to start out with if you know [virtually] nothing about endgames. If you're already familiar with basic concepts such as the opposition, triangulation, bishop and wrong rook pawn, etc. then you can either go with multiple books on specific types of endgames (such as Nunn's Secrets of Rook Endgames, Secrets of Pawn Endgames, Secrets of Pawnless Endgames) or a 1-volume work. If you going for a single volume, I would recommend either Dvoretsky's Endgame Manual by Mark Dvoretsky, or Fundamental Chess Endings by Karsten Muller and Frank Lamprecht. Both are very thorough, but also contain clear explanations and diagrams to illustrate key concepts and ideas.

I'm a big fan of "Grandmaster Secrets: Endings" by Soltis.  I also really like Emm's "The Survival Guide to Rook Endgames".  Have heard that Korchnoi's recent work on Rook endgames is great but is for fairly advanced players.

I was hoping I might follow Inn2's example from his thread on middlegame books and inquire about good manuals on the endgame.  What are the best books (recent or old) for a novice, intermediate, or expert player?