Here is a list of all topics with brief descriptions:

16color pseudo-bitmap mode
3D Sprite System
ASlib functions
Background Transition Effects
Bg Modes on 2 Screens
Bitmap mode
C++ wrappers
DS Motion functions
Debugging utilities
Fake 16bit bitmap mode
General Functions
Gif functions
Key input system
Keyboard
Math functions
Microphone
Mode 7 commands
Old large background system
Palette system
Palette system for Dual Screen
Rotating Backgrounds
Shape Recognition
Special Effects
Special controllers
Sprite system
Sprite system for Dual Screen
Text output system
Tiled Background Modes
Window system