John Hansen, the author and maintainer of NXC, the C-style programming language for the NXT, has now published a set of tools for the NXC development on Mac OSX.
NeXT Tools is
"a universal binary Mac OS X application which provides many of the tool windows that are part of the Bricx Command Center IDE. Included are: Direct controller, Diagnostics, Watch, Piano, Joystick, Remote, NeXT Explorer, NeXT Screen, Messages, Memory Map, Clear Memory, MIDI Conversion, Wav->RSO, Find Brick, Turn off brick, Close communication, and Firmware download",
as John states on the site from which the tools can be downloaded for free.
Nice stuff for Apple users!