This isn't really a Geeklet but it's a useful plugin for using with .glet files.
GletLook gives a nice preview of .glet files in Quick Look (press Space while the file is selected).
Installation
Download GletLook.qlgenerator.zip and double-click it to unzip.
Then drag GletLook.qlgenerator to /Library/QuickLook or ~/Library/QuickLook. You may need to create that folder if it doesn't already exist.
It sometimes take Quick Look a while to recognise the new plugin. Try logging out and in again, or alternatively type qlmanage -r into the Terminal and press Return.
Requires an Intel Mac running Mac OS X 10.6 Snow Leopard.
Source code is here if anyone is interested.
