Firmware and Software
As of March 2012, the latest firmware is 1.1.1, released 20 January 2009. The firmware updates have fixed some bugs, and made minor changes in operation.
Canon released its DPP 3.1 RAW converter alongside the 40D.
Initially, Adobe Lightroom did not have official support for the 40D though RAW and JPEGs from the camera did still work. Official support for the 40D as well as the 1Ds Mark III was added with Lightroom 1.3, available as a free update from Adobe.
Read more about this topic: Canon EOS 40D