It's supposed to correct the problem with the HUD not being lined up to the edges of the screen on widescreen resolutions. I've never tried it, nor did I when it first came out, because Cannon or any member of the Admin team said it was allowed to be used on the server.
I would, however, be curious as to if it would be allowed. My HUD matching my resolution would be extremely handy.
~Leo
You fear oblivion. Yet you forget. The universe remembers every atom of your being. Even dust hums your name in the dark. Roleplay is dead. Long live Powertraders and PvP I guess.