Have you had a look at py2app? Its pretty much py2exe for Mac OSX and creates a standalone app. You can handle the logger and configuration files pretty easily and keep your app nice and simple to distribute.
I usually store logger files in the users home directory as a hidden file - a lot of Mac OSX applications do this - i'm not sure if its officially the way to go but it works. The home directory is guaranteed to exist and you won't get permission errors like you would when you write to other random folders or to location inside the app bundle.
You can do this and keep your code cross platform buy opening files like this
import platform
import os
if platform.system() == 'Darwin': # We're on a mac
# Store the saved rates in the users home dir - note the dot at the start
# of the filename to keep the file hidden
home = os.path.expanduser("~")
filename = os.path.join(home, '.myHiddenLogger')
else: # We're on another platform, create whatever filename you were using before
filename = 'myLogger'
As for the configuration file, this answer here tells you how to bundle a resource file in with you're app. If you want to write stuff to this configuration file and save it for next time, you'll have to store it as a hidden file like the logger - this will stop the app from crashing due to permission errors when it tried to write to a file inside the app bundle.