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After installing Python 2.7 for Mac OS X from the Python.org binary I can't use Tkinter or IDLE.
I installed the following, on Snow Leopard:
* Python 2.7 PPC/i386/x86-64 Max OS X Installer Disk Image 
>>> import Tkinter
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/Tkinter.py", line 39, in <module>
 import _tkinter # If this fails your Python may not be configured for Tk
ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload/_tkinter.so, 2): no suitable image found. Did find:
	/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload/_tkinter.so: no matching architecture in universal wrapper

As a further oddity, if I run IDLE.app I get an IDLE shell (weird as from the command line Tkinter can't even be imported) - but I also get an error dialog that the subprocess can't be connected to and then IDLE shuts down.

Mark Dickinson confirms the problem and offers this diagnosis:
The python.org binary links to Tcl 8.4 (which doesn't seem to have a 64-bit version).
Perhaps this means having to have a separate installer for OS X 10.6.

Mark nails the issue: there is no 64-bit version of Tk on OSX 10.5.
I'm -1 on creating a 10.6 specific installer, two installers is confusing enough.
IDLE.app somewhat works because the Makefile makes sure it gets started using a 32-bit version of the interpreter (which is a quick workaround: 'arch -i386 python2.7' starts python in 32-bit mode an Tkinter is available there)
I can't find the specific issue right now, but did file a feature request a while back for a patch that allows us to ship copies of _tkinter linked to Tk 8.4 and Tk 8.5 while having a wrapper that loads the right one.
I am however slowly moving towards liking to ship a newer version of Tk with Python. That would have to be a minimal copy of the Tcl/Tk frameworks, and would definitely require feedback from people that actually use Tkinter.

I don't particularly mind what the fix is - but at the moment users can download and install Python from a python.org installer and then have an (apparently) non functioning IDLE and Tkinter.
At the very least we should advise users to install the 32bit only binary (which presumably works - I should try it) unless they *need* the 64 bit Python. (And also let them know that installing the 64 bit version means that Tkinter / IDLE doesn't work on Snow Leopard.)

I'm going to experiment with embedding a minimal version of Tk in the installer, which would both fix this issue and ensure that we use a version of Tk that is better adjusted to OSX (which should remove some other issues)
I want to do this during the europython sprint days.

Note that in the interim, there is a workaround for Snow Leopard users who want to use IDLE or Tkinter: use the 32-bit-only 2.7 OS X installer ("10.3") instead.

Have the same problem. Well, tried to install the 10.3 version over my 64-bit installation and that had no effect. Not sure how to get IDLE working.

@Sarth: Odd, works for me. Using the standard GUI installer on a 64-bit-capable machine running 10.6.4, I first installed the "10.5" 2.7 metapackage and verified that both IDLE.app and /usr/local/bin/idle2.7 fail. Then, even without manually deleting anything, I installed the "10.3" 2.7 metapackage and now both work.

I upgraded my working python from 2.5.1 (original install) to 2.7 (for macosx10.5) and got this:
** IDLE can't import Tkinter. Your Python may not be configured for Tk. **
I tried installing the applications, with no change. I tried the macosx10.3 version, same result. Installed the applications manually, same result. I downloaded 2.6.5 and again, same result. My next attempt will be the 2.5.5 version, but I do not expect and different result. 
I am using Leopard 10.5.8 with all software up to date. Any suggestions?

@Danielle: Are you sure you are launching the correct IDLE? In a terminal window, enter the following shell commands and report the output:
 cd /Library/Frameworks/Python.framework/Versions/2.7/
 file lib/python2.7/lib-dynload/_tkinter.so
 otool -L lib/python2.7/lib-dynload/_tkinter.so
 bin/idle2.7
That last should launch idle for 2.7. Quit it then in the Finder try double-clicking on the IDLE in /Applications/Python 2.7

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?

I downloaded "python-2.7.1-macosx10.6.dmg" file and tested if Tkinter and IDLE still have same issue reported here and I did not find anymore this issue.
I was able to launch IDLE and create a Tkinter GUI. From my side we can resolve and close this issue.

Works for me too. Great!