Canon have released a new firmware version for the EOS 1D MKII DSLR.

This firmware update (version 1.1.0) includes the following additional functons and improvements:

Improvements to AF tracking in AI Servo AF.
Reduced the time between when the camera is turned on and when it is ready to shoot.
Support added for the wireless file transmitter WFT-E1.

Website: Canon EOS 1D Mark II Firmware