I setup PyDev with this path for the python interpreter /System/Library/Frameworks/Python.framework/Versions/2.5/Python since the one under /usr/bin were alias and Eclipse won\'
I installed the Python.org version as well, this is a must.
I finally got PyDev working in Eclipse by pointing the interpreter to:
/Library/Frameworks/Python.framework/Versions/2.6/bin/python
manually. If you don't do it manually (by using the Autoconfig) it seems to not find the right version.