This is a grenade explosion effects mod. The explosions now look like some of the ones in the Hollywood action movies. These are new effects created from scratch but named using the stock fx names.
Multiplayer grenade modification to all CoD4 frag grenades nades explode on impact increased throwing distance increased throw speed decreased reload time decreased hold fire time massive
Here's an excellent new wallpaper by Hurricane that features the use of the 360-degree screenshot Infinity Ward released a while back. The picture has been tastefully added to with a few horizontal