From WikiTemp, the GBAtemp wiki

This is a list of the [essentials] topics of GBAtemp (that are still relevant).

Handhelds

GameBoy (Color)

[Essentials] GameBoy and Gameboy Color

GameBoy Advance

[Essentials] GameBoy Advance

Nintendo DS

[Essentials] Nintendo DS Games
[Multiplayer Essentials] Nintendo DS
[Essentials] DS Homebrew
[Essentials] DSiWare

Sony PSP

[Essentials] PSP Games
[Essentials] PSP Homebrew

Smartphone/iDevice

[Essentials] iDevice Apps
[Essentials] Android

Consoles

NES

[Essentials] NES Games

SNES

[Essentials] SNES Games

Nintendo 64

[Essentials] Nintendo 64 Games

GameCube

[Essentials] GameCube Games

Wii

[Essentials] Wii Games
[Online Multiplayer Essentials] Wii Games
[Essentials] WiiWare
[Essentials] Wii Homebrew

PlayStation

[Essentials] Playstation (PS/PSOne/PS1/PSX) Games

PlayStation 2

[Essentials] Playstation 2 Games

PlayStation 3

[Essentials] Playstation 3 Games

XBOX360

[Essentials] XBOX360 and XBL Arcade

TurboGrafx-16 (PC-Engine)

[Essentials] Turbografx-16

Dreamcast

[Esentials] Dreamcast

Sega Saturn

[Essentials] Sega Saturn

Sega Master System

[Essentails] Sega Master System

Genesis / Mega Drive

[Essentials] Genesis / Mega Drive

Other

YouTube Gold
[Essentials] Board Games
[Essentials] Anime
[Essentials] Films