No need to spend time fiddling with transparency layers and gradients in GIMP trying to obtain the (presumably soon to be passe) reflection effect with this neat plug-in:
http://registry.gimp.org/node/1025
Dave Koelmeyer
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This plug-in is no longer available for GIMP.
Thanks for the update. A quick search online gives me this:
https://github.com/otaviocc/
https://github.com/otaviocc/gimpscripts
The developer appears to have simply moved the project hosting to Github. Download the ZIP file (https://github.com/otaviocc/gimpscripts/downloads), unzip it, and move the extracted gimp-reflection.scm file to your preferred GIMP plugin directory (which is at ~/.gimp-2.6/scripts on my system). The reflection plugin should then appear at Filters -> Decor.