This topic holds links to the most relevant or helpful tutorial topics on the Resource Forums. If you think there's another one that should be listed, feel free to suggest it. New tutorials are appreciated, too!
Sprite Ripping
Arcade Game Sprite Ripping / "Hard Ripping"
Avengers Alliance Sprite Ripping (Flash)
CPS1/CPS2 & Neo Geo Ripping Tutorial
GBA Sprite Ripping Tutorial (video tutorial, blocked in some countries)
PC Engine / Turbografx 16 Ripping Tutorial
PlayStation Ripping Tutorial
Ripping from MAME (Arcade)
Sharp X68000 Ripping Tutorial
Mega Drive/Genesis Ripping Tutorial
Super Nintendo Ripping Tutorial
Model Ripping
Blender OBJ fix + Noesis OBJ fix
Cleaning up random gaps (Blender)
Game Specific Model Ripping Guides
How to rip N64 Models the Right Way
How to rip PS2 models
How to use GameAssassin
Model Ripping Guide For Beginners - BRRES Format
Smooth shading with Blender
Sound Ripping
Ripping GBA music/sound effects
Texture Ripping
Nintendo 64 Texture Ripping
General Ripping
DS Ripping Guide - Sprites, Sounds, Textures
Ripping files from WiiWare - WAD files
Misc.
FamiTracker Tutorial - (Chiptune) Music
Previous' Spriting Dictionary - Shamelessly linking to my own website, yes.
Sprite Ripping
Arcade Game Sprite Ripping / "Hard Ripping"
Avengers Alliance Sprite Ripping (Flash)
CPS1/CPS2 & Neo Geo Ripping Tutorial
GBA Sprite Ripping Tutorial (video tutorial, blocked in some countries)
PC Engine / Turbografx 16 Ripping Tutorial
PlayStation Ripping Tutorial
Ripping from MAME (Arcade)
Sharp X68000 Ripping Tutorial
Mega Drive/Genesis Ripping Tutorial
Super Nintendo Ripping Tutorial
Model Ripping
Blender OBJ fix + Noesis OBJ fix
Cleaning up random gaps (Blender)
Game Specific Model Ripping Guides
How to rip N64 Models the Right Way
How to rip PS2 models
How to use GameAssassin
Model Ripping Guide For Beginners - BRRES Format
Smooth shading with Blender
Sound Ripping
Ripping GBA music/sound effects
Texture Ripping
Nintendo 64 Texture Ripping
General Ripping
DS Ripping Guide - Sprites, Sounds, Textures
Ripping files from WiiWare - WAD files
Misc.
FamiTracker Tutorial - (Chiptune) Music
Previous' Spriting Dictionary - Shamelessly linking to my own website, yes.