Rebuilding a python system
Learning the hard way how intricately and brittle my previous system's set of Python scripts and programs were intertwined with the OS.
I had paths pointing to my personal SVN repository's library trunk, customized sitecustomize.py, and a number of programs had dependencies on either other packages which had installed manually, or on system software that I had not documented.
So now I find that I cannot launch BODI (since it was basically one big file with dependencies on wxPython), or use my Privoxy user.action script (depends on VersionedFile), or check my system's temperature with a script (ok, that one has to do with running it on a new machine with significantly different hardware).