Since the dawn of the FPS we've been hunting for health and ammo. These noble cubes have housed them for us, faithfully waiting for our crowbar.
A small tribute, we salute you, noble crate:
http://www.youtube.com/watch?v=VaHS-y_mapQ
(also a good Crysis tweak)
Gather around, share your love for the crate. The single most important element of any FPS.
3rd Party Wall of Shame
http://www.nintendoworldreport.com/forums/index.php?topic=30478.msg581036#msg581036