target for working app on Mac OS X 10.7
better look?
no more 10.7 specific builds
uses and requires PIL
Info.plist
dont strip when build mac os app
Menu (for mac os only?)
wooden background texture
Refactoring and better updating during resize
Make PIL optional
Show error if no ttk available
moving imports around
Command line arguments for easier testing

nopil -- simulate that PIL is not available
nottk -- simulate that ttk is not available
add GPLv2 license
typo in comment
Fancy next problem button + minsize to accomodate it
Great refactoring, UI as a separate class
Put buttons in a buttonbox

All one of them.