Interesting books that I come across:
(You can buy one for me if you wish) :)

Common Practical Lisp
Thanks to the authors for making this available online. Bought the book as well.

Calendrical Calculations
Justin bought me this already! Thanks Justin!

Writing Perl Modules for CPAN
Thanks to the authors for making this available on the internet

How to Design Programs An Introduction to Computing and Programming

Geometrical Methods of Mathematical Physics

Successful Lisp

Common Lisp: A Gentle Introduction to Symbolic Computation

Uncertainty: Einstein, Heisenberg, Bohr, and the Struggle for the Soul of Science

Warped Passages: Unraveling the Mysteries of the Universe's Hidden Dimensions

The Implementation of the Icon Programming Language

Basic Category Theory for Computer Scientists

Modern Compiler Design

Purely Functional Data Structures

Advanced Topics in Types and Programming Languages

The Haskell School of Expression

Formal Semantics

An Introduction To Lambda Calculi For Computer Scientists

Artificial Intelligence: A Modern Approach

David A. Patterson, John L. Hennessy

Transactional Information Systems: Theory, Algorithms, and the Practice of Concurrency Control

Computer Architecture: A Quantitative Approach

Introduction to the Theory of Computation

A Discipline of Programming

Andrew Tanenbaum

Enumerative Combinatorics: Volume 1

Design Patterns Explained: A New Perspective on ObjectOriented Design

Compiler design in C

The Calculi of Lambda Conversion

The Lambda Calculus (Studies in Logic and the Foundations of Mathematics)

C Interfaces and Implementations

C Programming FAQs : Frequently Asked Questions

Flexible Pattern Matching in Strings

Combinatorial Optimization : Algorithms and Complexity

Concrete Mathematics: A Foundation for Computer Science

Categories for Types

The Lambda Calculus

The Equation that Couldn't Be Solved

Proofs and Types

Semantics of Programming Languages: Structures and Techniques

The Art of Computer Programming

Concepts, Techniques, and Models of Computer Programming

Physics of Finance: Gauge Modelling in NonEquilibrium Pricing

My Life as a Quant: Reflections on Physics and Finance

The Computational Beauty of Nature

Complexity: Hierarchical Structures and Scaling in Physics

Some Basic Theory for Statistical Inference

Brain, Meaning, Grammar, Evolution

The Statistical Mechanic

Essentials of Programming Languages

Emergence From Chaos to Order by John Holland

The Nature of Statistical Learning Theory

Truth from Trash How Learning Makes Sense

Error and the Growth of Experimental Knowledge

Operational Risk Measurement and Modelling

An Introduction to Computational Learning Theory

Mathematical Logic by Willard Van Orman Quine

Geometry Civilized History, Culture, and Technique

Emmy Noether 18821935 by Auguste Dick

Physics from Fisher Information A Unification

The First Moderns Profiles in the Origin of TwentiethCentury Thought

Distress by Greg Egan

Permutation City by Greg Egan

Fragile Objects Soft Matter, Hard Science, and the Thrill of Discovery

The Life and Legacy of G. I. Taylor

Infinitesimal Calculus

Calculus by Michael Spivak

Linear Algebra Done Right

Abstract Algebra and Solution by Radicals

Algebra by Michael Artin

Vector Calculus, Linear Algebra, and Differential Forms: A Unified Approach

Introduction to Topology: Third Edition by Bert Mendelson

Topology (Undergraduate Texts in Mathematics) by K. Jänich

Ordinary Differential Equations by V. I. Arnold

Real Mathematical Analysis by Charles Chapman Pugh

Calculus  Early Transcendentals by Howard Anton

Elementary Differential Equations (4th Edition) by William R. Derrick, Stanley I. Grossman

Partial Differential Equations: An Introduction by Walter A. Strauss

A First Course in Abstract Algebra, Seventh Edition by John B. Fraleigh

Principles of Mathematical Analysis, Third Edition by Walter Rudin

Topology (2nd Edition) by James Munkres

Introduction to Modern Set Theory

Introduction to Mathematical Logic, Fourth Edition by Elliott Mendelson

Complex Analysis by Joseph Bak

Euclidean and nonEuclidean geometries: Development and history by Marvin J Greenberg

Introductory Combinatorics (3rd Edition) by Richard A. Brualdi

Yet Another Introduction to Analysis by Victor Bryant

Metric Spaces by Victor Bryant

Real Variables: With Basic Metric Space Topology by Robert B. Ash

General Theory of Functions and Integration by Angus E. Taylor

Principles of Real Analysis, Third Edition by Charalambos D. Aliprantis

Complex Analysis by Ian Stewart

Visual Complex Analysis by Tristan Needham

Complex Analysis with Applications by Richard A. Silverman

Course of Theoretical Physics : Mechanics
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Introduction to Hilbert Spaces with Applications, Second Edition by Lokenath Debnath

Programming Language Pragmatics
Bought this already.