Camera Bits recently updated Photo Mechanic for Windows and Mac to v4.3.5.
The release fixes a fairly long list of minor bugs, adds support for the browsing of RAW files from the Canon EOS Digital Rebel XT, displays D2X files in the appropriate colour space (by properly interpreting the colour space choice associated with Color Modes I and III) and adds Mac OS X 10.4 (Tiger) compatibility.
The release is a free update for anyone who purchased the software in about the last 16 months.