How to fix German Key Layout for Microsoft Keyboards with MacOS 10.6 Snow Leopard

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