The ultimate List:

Top Programming (on Languages):

Eloquent JavaScript: A Modern Introduction to Programming

by Marijn Haverbeke

JavaScript: The Good Parts

by Douglas Crockford

Learn Python The Hard Way

Zed. A. Shaw
2010
Second Edition

Agile Web Development with Rails

Fourth Edition
Sam Ruby, Dave Thomas, David Heinemeier Hansson
2011
The Pragmatic Bookshelf
978-1-934-35654-8

Effective Java

Joshua Bloch

Objective C Programming: The Big Nerd Ranch Guide

Aaron Hillegass
Addison-Wesley Longman, Amsterdam
978-0321706287

Professional Android 4 application development

Reto Meier
2012
978-1-118-10227-5

iOS Programming: The Big Nerd Ranch Guide

3rd revised edition
Aaron Hillegass
Addison-Wesley Longman, Amsterdam
978-0321821522

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Top General Programming (non language specific):

Head First Design Patterns

O'Reilly
978-0-596-00712-6
Eric Freeman & Elisabeth Freeman

Introduction To Algorithms, Third Edition (Paperback)

MIT Press
9780262533058
By Thomas H. Cormen, Charles E. Leiserson, Ronald L. Rivest and Clifford Stein

The Pragmatic Programmer: From Journeyman to Master (Paperback)

Addison-Wesley Professional
978-0201616224
Andrew Hunt

Git - Verteilte Versionverwaltung für Code und Dokumente

Open Source Press München
978-3-941-84142-0
Valentin Haenel & Julius Plenz

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2nd Place Programming Languages

JavaScript Web Applications

by Alex MacCaw

Python Pocket Reference

Mark Lutz
2009
Fourth Edition
O'Reilly
978-0596158088

Beginning Android 4

Grant Allen
2012
978-1-4302-3984-0

Javascript Patterns

by Stoyan Stefanov

JavaScript: The Definitive Guide

by David Flanagan

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2nd Place General programming

Clean Code: A Handbook of Agile Software Craftsmanship

Prentice Hall International
978-0137081073
Robert C. Martin

Continuos integration, improving software quality and reducing risk

Addison-Wesley Professional
978-0321336385
Paul M. Duvall

Test Driven Development. By Example

Addison-Wesley Signature Series
978-0321146533
Kent Beck

Growing Object Oriented Software, Guided by Test

Addison-Wesley Professional
978-0321503626
Steve Freeman

Refactoring, improving the desing of existing code

Addison-Wesley Professional
978-0201485677
Martin Fowler

Refactoring to patterns

Addison-Wesley Professional
978-0321213358
Joshua Kerievsky

Implementation patterns

Addison-Wesley Professional
978-0321413093
Ken Beck

Analysis patterns, reusable object models

Addison-Wesley Professional
978-0201895421
Martin Fowler

Apprenticeship patterns, Guidance for the Aspiring Software Craftsman

O'Reilly Media
978-0596518387
Dave Hoover

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OpenSource, Hacking and Startup-Culture

(if there is still money left, in this order)

The Hitchhiker's Guide to the Galaxy

by Douglas Adams

The Cathedral and the Bazaar: Musings on Linux and Open Source by an Accidental Revolutionary

by Eric Raymond

Just for fun: The Story of an Accidental Revolutionary

by Linus Torvalds

Rework

by Jason Fried & David Heinemeier Hansson

How to win friends and influence people

by Dale Carnegie

Business Model Generation

by Alexander Osterwalder & Yves Pigneur
John Wiley & Sons
978-0470876411

1984

by George Orwell

2001: A Space Odyssey

by Arthur C. Clarke

Dune

by Frank Herbert

Delivering Happiness: A Path to Profits, Passion, and Purpose

by Tony Hsieh

Program or Be Programmed: Ten Commands for a Digital Age

by Douglas Rushkoff

Microserfs

by Douglas Coupland

JPod