in short: get Ukulele and extract these files out of the .DMG: LogitechGerman.keylayout and LogitechGerman.icns. Copy them to the /Library/Keyboard Layouts/, open the Language & Text preference pane and activate the “Logitech German” layout.
Found at:
http://blog.zottmann.org/post/210093621/upgrading-to-snow-leopard
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