For the record, after some discussion at EuroPython and on the Pythonmac-SIG mailing list (thread starting here: http://mail.python.org/pipermail/pythonmac-sig/2010-July/022467.html), the current plan is to make the "64-bit" installer variant support OS 10.6 (and above) and 2-way Intel (i386, x86_64).  That way the installer can be linked with the 10.6 Tk 8.5 which supports both 32- and 64-bit and avoids the unnecessary compilation for PPC arch.

Ronald, since it might be a while until a 2.7.1 release comes out, would it be possible to make available a new vanilla 2.7 installer to replace or supplement (this time only) the original 64-bit one?