If you're interested in DS ROM hacks of New Super Mario Bros. (DS), here’s a thoughtful breakdown:
I understand you're looking for a "deep post" about downloading a ROM hack of New Super Mario Bros. Wii for the DS — but just to clarify, New Super Mario Bros. Wii is a Wii game, not a DS game. You may be thinking of New Super Mario Bros. (DS) or a fan-made hack that ports Wii elements to DS.
ROM hacking has kept classic Mario games alive for over a decade. The New Super Mario Bros. DS hack scene, in particular, is vibrant — with custom levels, new power-ups, and even hard-mode remakes. Popular hacks include New Super Mario Bros. 3 (a full conversion into SMB3 style) and New Super Mario Bros. Starry Nights .