There's nothing like real-world usage to flush out the last few bugs, as evidenced by the quick update to Keyboard Maestro 4.3.1, which fixes potential crashes when executing AppleScript or shell scripts, and when using device triggers. A few other minor bugs have also been fixed, and Stairways Software also added support for naming more X-Key keyboard keys and improved handling of negative numbers in the Move Window action. Full release notes are available. ($36 new, free update, 9.1 MB)
Turn Off Filename Extension Warning
In Leopard, Apple fixed an annoying aspect of working with the Finder in Tiger. Previously, if you changed a file's extension, the Finder prompted for confirmation. But since no one has ever accidentally changed a filename extension, Apple thankfully added an option to turn that warning off in the Leopard Finder's preferences. Choose Finder > Preferences, and in the Advanced screen, deselect Show Warning Before Changing an Extension.