Shan Store

-Has the latest products
-Straight from China
-Incredibly fast responses

PSXBoy

-Always has the latest items
-Great selection
-Cheap prices

KickGaming

-Great selection
-Based in Canada
-Superb support

MiniOnlineStore

-World seller
-Wholesale prices
-Free worldwide shipping

BambooGaming

-Cheap prices
-Great selection
-Fast shipping

Shop01Media

-2 big stocks within Europe
-Worldwide delivery, tax free
-Prompt replies and shipments

RealHotStuff

-Great Retailer with large selection
-Fast shipping
-Great Support, even has a forum

NXPGame

-Great selection for vairous consoles
-Very personal emails
-Cheap Prices

Gamespot - Some great reviews as well as the fastest news in terms of games before release.

IGN - The most fair reviews when it comes to Nintendo DS.

GBATemp - Lots of general information about DS and flash carts. Great reviews of some hardware as well as a ton of tutorials, and a great forum.

GBADev - When it comes to homebrew, this site is your best source.

RomNet - Great site with a large database of reviews as well as useful resources such as comparison between different retailers.

Moddz - Latest news of anything related to flash carts and homebrew is always posted up there.

SCDev - Great forums, with a great market place. It isn't just for Supercard despite its name.

M3 Forums - An M3 support forum.

EZ Flash Forums - An EZ Flash support forum.