Canon Japan has posted new firmware for the 20D
It includes the following additions/improvements:
1. Support for the wireless file transmitter WFT-E1.
Support for the wireless file transmitter WFT-E1 allows high-speed image transfer by connecting EOS 20D and personal computers through wireless/wired LAN.
*This function works for EOS 20D when the WFT-E1 firmware is 2.0.1 or later.