Summary: Netbeans 6.9.1, Mac OS 10.5.8 (Intel), Python 2.6 and 2.7 (attempted).
Attempted to utilize Python 2.7 (also tried 2.6) as an updated platform to 2.5.1. Distributions are both Mac .dmg's obtained from the official site.
Installed Python 2.x on machine prior to attempting to integrate into NBs IDE.
1.Tools > Python Platforms
2a. Pointed to /System/Library/Frameworks/Python.framework/Versions/2.5/Resources/Python.app as indicated by the dialog box. (expected to be able to go further to /Contents/MacOS/Python as in the 2.5.1 example, but could not go further).
--> Result, 'Invlaid Python type.' (yep, that's how it's spelled.)
3. Attempted altering current platform name (2.5.1) and path to point to both the .../Python.app and .../Python.app/Contents/... as above in both cmd and console cmd inputs.
-->Result: When attempting to start a new project with the new reference to 2.7, received warning in Python Platform dropdown box "must use valid..." etc etc.
Have filtered through both the documentation and previous bugs and can't seem to get a handle on this one, so I can make neither a sound diagnosis of the problem nor provide a suggestion.