St. Clair Software has released Default Folder X 4.6.6, reassigning the Command-D shortcut to jump to the Desktop rather than invoke the Duplicate command. The Open and Save dialog enhancement utility now enables you to use its Rebound feature (to quickly return to recently used folders) in column view, fixes a bug that caused some apps (like Monosnap) to save files with the wrong file names, and disables audio previews by default to avoid triggering OS X to switch to the high performance graphics processor on some Macs. ($34.95 new, $10 off for TidBITS members, free update, 10.7 MB, release notes, 10.6+)
Mac OS X Zip Expanding Utility
Firefox (and possibly other applications) may ask you what you want to do with .zip archives that you download from the Internet. If you want to expand them with Mac OS X (rather than StuffIt Expander), you may be unsure of which application actually does the job. You're looking for Archive Utility (in Leopard and later) or BOMArchiveHelper (in Tiger). In either case, the application is stored in Hard Drive/System/Library/Core Services/. Don't move it from there, though, or you'll confuse matters.
Default Folder X 4.6.6
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By reverting command+D to "Desktop," I can once again use my Mac intuitively, quickly, and nicely, returning DefaultFolder X to my most indispensable utility for the Mac.