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Now that ActiveState has released a version of Tcl/Tk 8.5 (8.5.9.2) for Mac OS X that is also an Aqua Cocoa Tk (like the Apple-supplied Tk 8.5.7 in 10.6) and supports 64-bit, versions of Python linked with the new ActiveTcl 8.5.9 do not display the problem reported here as well as a number of other problems reported elsewhere. Unfortunately, as released, the 64-bit/32-bit python.org Python 2.7.1 for 10.6 links only to the Apple-supplied Tcl/Tk 8.5. Until the next release of Python 2.7 (2.7.2), the best workaround without rebuilding remains to use the 32-bit-only installer for 2.7.1.
There is now a webpage that summarizes the somewhat confusing state of affairs with regard to Tcl/Tk support with Python on Mac OS X:
http://www.python.org/download/mac/tcltk/