GBA DEV NEWS         GBA Development Scene News Site
GBA DEVRS            Jeff's GBA DEVRS
GBAEMU NEWS          Guyfawkes's development and emulation site

DARK FADER'S SITE    Dark Fader's Development site, lots of great GBA stuff here
JOAT'S SITE          Joat's Development site.  Home of MAPPY VM.
VISUAL BOY HOMEPAGE  Home of Visual Boy Advance (GBA and GBC Emulator).
DEVKITADV            Compiler Package including the latest GCC for Win9x+.

CYGWIN               Build Unix programs on Windows
GCC                  Free multi-platform C, C++ compilers
GDB                  Free multi-platform Debugger
Insight              Built in GUI for GDB