Breeze Systems have just released a beta version of BreezeBrowser with Canon EOS 20D raw conversion support.

BreezeBrowser 2.11 beta 1 can be downloaded from:

http://www.breezesys.com/BreezeBrowser/support.htm#20D

You need to install Canon’s EOS Viewer Utility v1.1 software for this to work. A full release is planned for early November after Canon have released a new SDK for the 20D.