As expected, Infinity Ward has confirmed
that the problems of the PS3 version of Call of Duty 4 following the release of firmware v2.01 are now over and done with.
They announced that gamers should no longer be receiving error messages or any other issues related to the firmware update in the game and they thanked for everyone letting them know so they could get the issued resolved efficiently.
The actual fix is separate to a forthcoming patch for the PS3 and Xbox 360 versions which promised optimisation of the multiplayer experience. However patch v1.2 for the PC is available to grab from http://www.infinityward.com/modernwarfare/patch/.
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