Region-Free Titles

[Neftoon]

Hello,
Over here in Region B some US titles will play on our players and others which are actually encoded do not. I was wondering if there was any one here who might be able to tell me of discs that won't work on their region b machines which they have gotten from the states.
So Far these titles have worked no problems on my player:
The Fifth Element
The Fugitive
The Corpse Bride
Tomb Raider

And this one has come as belonging to another region.
The Brothers Grimm.

Any one able to tell me discs I can safely buy from the states?