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Data Structure/Algorithms 
Information Theory, Inference, and Learning Algorithms (David J.C. MacKay)
The Algorithm Design Manual (Steven Skiena) Lecture Notes on Optimization (Pravin Varaiya)
Computer Programming Algorithms Directory Dictionary of Algorithms and Data Structures
Algorithms (Shai Simonson) Lecture Notes on Computational Complexity (Luca Trevisan)
Sorting and Searching Algorithms (Thomas Niemann) A Genetic Algorithm Tutorial (Darrell Whitley)
Problems on Algorithms, 2nd Edition (Ian Parberry and W. Gasarch) [Homepage]
Combinatorial Algorithms (Jeff Erickson) Lecture Notes on Algorithms (Ian Parberry) ©2005
Information Retrieval (C.J. van Rijsgergen) [Mirror] Algorithms for Programmers (Jörg Arndt)
Introduction to Complexity Theory (Oded Goldreich) [with Summaries]
Data Structures and Algorithms (John Morris) [Mirror] Data Structures through Java (Peter M. Williams)
An Introduction to Computational Complexity Data Structures and Algorithms (Alison Cawsey)
Lecture Notes on Algorithm Analysis and Computational Complexity, 4th Edition (Ian Parberry)
Efficient Algorithms for Sorting and Synchronization (Andrew Tridgell, PDF)
Computer Animation: Algorithms & Techniques (Rick Parent)
Handbook of Algorithms and Data Structures (G. Gonnet, R. Baeza-Yates)
Algorithms and Complexity (Herbert S. Wilf) Parallel Complexity Theory (Ian Parberry) [Homepage]
Data Structures and Algorithms with Object-Oriented Design Patterns in Java (Bruno R. Preiss)
Data Structures and Algorithms with Object-Oriented Design Patterns in C++ (Bruno R. Preiss)
Data Structures and Algorithms with Object-Oriented Design Patterns in C# (Bruno R. Preiss)
List of algorithms [Another]  
Collected Algorithms of ACM The Stony Brook Algorithm Repository