10.5 ships with uppercase menu items in the Finder's sidebar, similar to recent versions of iTunes. To make things lowercase like they should be, do the following. First, navigate to (or copy and paste the following into the Go » Go to Folder dialog):


Duplicate the file called LocalizableCore.strings, and keep the duplicate as a backup. Open the original with Xcode or a text editor, then edit lines 50 to 53 to make them lowercase:

"SD5" = "Devices";
"SD6" = "Shared";
"SD7" = "Search for";
"SD8" = "Places";

Save the file (entering your admin password if asked) and log out and back in or open Terminal and type killall Finder to relaunch the Finder and see your changes.

[robg adds: This hint explains how to do the same for iTunes.]