Languages/Scripting/Perl

.NET	7
Artificial Intelligence	7
Group behavior	2
Path finding	16
A* and its derivatives	6
Pattern recognition	1
Steering behavior	2
World interaction	4
Audio	0
DirectX	8
DSP	5
Ogg Vorbis	2
OpenAL	1
Windows	1
Computer Science	2
Algorithms & data structures	12
BSP trees	8
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Input	3
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Graphics	27
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DirectX	24
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Deferred lighting	7
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Lighting models	6
Screen Space Ambient Occlusion	4
Shadow maps	18
Shadow volumes	15
Image processing & synthesizing	19
Non-polygonal rendering	3
Ray tracing	3
OpenGL	12
Particle systems	7
Shaders	32
Simulation	4
Cloth	2
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Fire & smoke	4
Liquids	12
Surfaces & Meshes	8
Implicit surfaces	6
Parametric curves & surfaces	7
Polygon reduction & LOD	3
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Continuous LOD	12
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Voxel engines	2
Text	6
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Languages	5
Assembler	20
C & C++	26
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D	2
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Perl	2
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Platform	2
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Mac	2
Windows	13
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Input	2
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Shell	2
Small executables	3
Windows	8
Web Technologies	8

Practical Perl Programming
1999 - A D Marshall
A good online book on Perl programming.

Perl Cookbook
Aug, 1998 - Tom Christiansen, Nathan Torkington
This online book of 794 pages, is an excellent reference for Perl programmers.