The MacBook Pro 15-inch SMC Firmware Update 1.2, MacBook SMC Firmware Update 1.2, and MacBook Air SMC Firmware Update 1.1 all address the same issues. The update improves the sensing and accuracy of the MagSafe Power Adapter indicator light, and the battery charge indicator lights.
MacBook Pro EFI Firmware Update 1.6, MacBook Air EFI Firmware Update 1.1, and MacBook EFI Firmware Update 1.3 all fix several issues to improve the stability of the MacBooks.
The proper update for your machine will automatically show up in the software update mechanism when it's run. You can also visit and choose your update.