Okay, let me be completely clear: I think that even a comparison tool between license-incompatible maps is a bad idea. Better? (As for "why it's a bad idea" -

Okay, let me be completely clear: I think that even a comparison tool between license-incompatible maps is a bad idea. Better? (As for "why it's a bad idea" - it could tempt people to copy data from one to the other, which is definitely a Really Bad Idea)