DS tutorials:

Recommended NDS Tutorial -
http://www.patatersoft.info/manual.html

Beginners DS dev page -
http://www.double.co.nz/nintendo_ds/index.html

OpenGL on DS -
http://ethos.oddigytitanium.com/

Another DS 3d Tutorial -
http://delfare.pizz.biz/tutoEN.htm

Aaron Recomends This Which Is Not As Dated (PA_lib) -
http://www.palib.info/wiki/doku.php

PA_lib DS Tutorial -
http://www.aaronrogers.com/nintendods/PA_Lib/

C++ Based DS Dev -
http://www.dspassme.com/programmers_guide/tutorial/

MacOS DS Dev Tutorials (unfinished) -
http://users.rcn.com/n8mobiles/extras/macday1.html

Homebrew Programmers Guide to the Nintendo DS (unfinished) -
http://www.dspassme.com/programmers_guide/tutorial/

DS Programming Guide -
http://www.dev-scene.com/NDS_Tutorials_Day_1
http://www.dev-scene.com/NDS_Tutorials_Day_2
http://www.dev-scene.com/NDS_Tutorials_Day_3

General DS Links:

Aaron's Link Page (great list of well-orginized general DS links) -
http://www.aaronrogers.com/nintendods/links.php

Cearn's Link Page (also a well orgainized page of links (mentions some good book refrences too)) -
http://user.chem.tue.nl/jakvijn/tonc/refs.htm

Another General DS Site (has info on python for the ds) -
http://www.dsdeveloper.co.nz/

Home of the Most Popular SDK (for DS and GBA) -
http://www.devkitpro.org

DS Video Modes Info -
http://tobw.net/dswiki/index.php?title=Graphic_modes

DS Homebrew Site -
http://dshb.fileplace.biz/

MTClib (for multi-thread applications)-
http://www.softsystem.co.uk/page9.html

C/C++(and more!) Tutorials/eBooks:

General - http://www.programmingtutorials.com/

General eBooks - http://www.programmingebooks.tk/

C/C++ - http://cplus.about.com/od/beginnerctutoria1/l/blctut.htm
C/C++ - http://www.cprogramming.com/tutorial.html
C/C++ - http://devcentral.iftech.com/articles/C++/default.php

C/C++ eBooks - http://www.devkitpro.org/reading.shtml

C Specific - http://www.lysator.liu.se/c/bwk-tutor.html
C Specific - http://www.cyberdiem.com/vin/tutorials.html

C++ Specific - http://www.intap.net/~drw/cpp/
C++ Specific - http://www.cs.wustl.edu/~schmidt/C++/
C++ Specific - http://www.cplusplus.com/doc/tutorial/
C++ Specific - http://www.functionx.com/cpp/

C++ Tutorial for C Users - http://www.4p8.com/eric.brasseur/cppcen.html

ASM Specific:

ARM GCC Inline Assembler Cookbook - http://www.ethernut.de/en/documents/arm-inline-asm.html

GCC-Inline-Assembly-HOWTO - http://www.ibiblio.org/gferg/ldp/GCC-Inline-Assembly-HOWTO.html#s4

ARM ASSEMBLER PROGRAMMING - http://www.heyrick.co.uk/assembler/

and of course, last but not least, the GCC manual, available from - http://gcc.gnu.org/onlinedocs/

GBA Tutorials:

<NOTE FOR BEGINNERS> GBA games will run on the DS so learning to program the GBA will help out if you feel there is a lack of info on DS development. Plenty of resources are available.

TONC (Great Tutorial (even teaches mode 7 graphics programming)) -
http://user.chem.tue.nl/jakvijn/tonc/toc.htm

An unpublished book using Visual HAM as the IDE (read wintermutes second post before using this book) -
http://www.jharbour.com/gameboy/default.aspx

Good Tutorials (new home of The Pern Project) -
http://drunkencoders.com/index.php?system_id=2&page=Tutorials

Tutorial Using HAM -
http://www.aaronrogers.com/ham/

GBA Programming Tutorials Along With Some ARM Links (Mostly Outdated)-
http://www.gbajunkie.co.uk/

Short "Mode 7" Explanation-
http://www.taswegian.com/TwoHeaded/mode7.html

퍼온곳도 불펌이랬지만
나 역시 불펌;;