The Algorithm Design Manual (just the first few chapters of refresher on data structures and stuff) and Cracking the Coding Interview.

My girlfriend knows multiple SWEs at Google who recommended reading the Algorithm Design Manual as a top tier study guide for Google's interview questions, to add another point of anecdata.

Yep. Again, this advice can be overwhelming: it's not the entire book that is the most useful part, it's the refresher material at the beginning that does a great job of covering the kind of stuff that shows up constantly in interview questions.

I still enjoy reading The Tomes of Delphi: Algorithms and Data Structures. It's an old book but it's so readable.