Chiptune Upload Server :: A public dump for chiptunes.
NESDev :: The biggest nes programming resource.
Nerdtracker II :: NSF Tracker homepage.
MCK :: Home of the NES sound driver.
Sounds of the 2A03 :: NSF and related tunes, tools and info on NES music.
Zophar's NSF Archive :: A game NSF archive.
Chiptune.com :: A selection of chiptunes ranging various formats.
Kohina :: THE chiptune radio featuring NES tunes.
8bitpeoples :: Free chiplabel featuring NES music.
Digital Sound Antiques :: Comparison of NSF playback on emulators and the real thing.
MCK development chiptunes in 2ch :: Tunes, documents and tools.
Akumu's NSF Archive :: Well maintained archive of commercial NSF's

Vorc :: The latest general and chiptune scene news.
Scene.org :: The largest scene productions file server.
No Error :: Scene music news.
Scene Music :: Scene and demo music news.
Pouet :: Big scene production and news portal.
Orange Juice :: Big scene information portal.
Micro Music :: Scene community portal and music label.
Gamewave Podcast :: Podcast show featuring a wide array of videogame and chipgenres.

HVSC :: The High Voltage SID Collection. The biggest c64 music files collection.
ASMA :: The Atari SAP music file archive.
SNES Music :: A large collection of Super Nintendo music files.
Zophar's Domain :: Lots of emu software, tools and utilities.
MSX.org :: MSX portal.