MacRocks - A comprehensive source for information about making music on Macintosh computers. Features Mac audio news, hardware and software reviews. - http://www.macrocks.com/
Mac OSX MIDI Developers Resource - Caters to developers of MIDI applications under Mac OSX. Online Apple documentation available as well as custom examples. - http://xmidi.com/
MacMusic - Making music with a Macintosh: Resources, more than 1200 searchable links, downloads, updates, drivers, classified ads, mailing-list, articles, info. All you need to make music with your Macintosh, free and available in English and French. - http://www.macmusic.org/