At $work configuration and data files goes to:

• /usr/local/ + /var/local/
• /opt/
• /srv/
• /etc/ + /usr/ + /var/ + /srv/
• File::ShareDir
• File::HomeDir
• /my-project/ || /my-company/ || /local/ || /shared/ || /data/ || /.../
• ./
• "C:\Documents and Settings\All Users\Application Data"
• __DATA__
• MyApp::Config
• wherever
• don't remember, let me check
• /dev/null
• somewhere else