Join the Federalist Moderates today!

Microsoft
Microsoft's web site

Nintendo
Nintendo's web site

x86 Resources
Intel's web site
Best Win32ASM Tutorials

GBA Resources
GBADev.org - The hub of activity for GBA programming.
The Pern Project  - All my asm tutorial's assume you know this 
stuff.
Arm's web site - Maker's of the GBA's CPU.

NES Resources
NESDEV - The hub of activity for NES programming.

SNES Resources
NESDEV - Check the links on NESDEV in the SNES section.

N64 Resources
Dextrose - Not much, but yes, it's the hub for the N64.
Halley's Comet Software - This guy's great! The author of an NES emu
for the N64, completely written in ASM. Check out his assembler package.

Sega Genesis Resources
Sega Programming Network - Has what is
supposed to be a Genesis ASM Tutorial, but it seems that the author has too many personal problems to update it
often...

Tutorial Translations
Dark Schneider Translations - NES ASM -> Italian.
(Anyone sees other translations, send them in, I'll list them here)
(If you want to do a translation, feel free to, condition is adding a "Originally by Mike H aka GbaGuy")
(Please email me your link as well for inclusion here.)

Other
Zophar's Domain - Da Best emulation news site. Check out the Tech Docs section.
Hyde's Projects - Website of one top-notch programmer! Check out his site.
Cearn Space - A (mostly) GBA related page containing a
tutorial. He tried tell me about errors in the tuts, but I was unable to get around to answering him. Another top-notch
programmer. Check out his GBA tutorials!

CloneGB - A GameBoy emulator project coded by TeamZ, zAe, and myself.