New GRASS binaries! 6.1 CVS. Universal for PPC and Intel. Aqua-fied, so there is no need for X11, even for NVIZ! There is a Tcl/Tk Aqua/Universal download on the GRASS page also. This is experimental and I'm providing it for testing purposes, so there may be (probably are) problems. One is that NVIZ works on PPC but crashes on Intel, at least on my MacBook (non-Pro).
I will try to update this from the weekly snapshots, or whenever I can fix Mac problems.