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This application sits in your system tray and periodically checks Stack Overflow for any new badges or reputation. It also displays your current reputation, allows for manual updates, and automatically opens a new tab in your browser and brings you to your user/reputation overview page.
BSD License. http://creativecommons.org/licenses/BSD/
No direct download at the moment. Can be cloned via GitHub.
Was written and tested on Debian Unstable.
It should theoretically work anywhere Python 2.6 and PyQt 4 is installed (and working). I don't have the ability to test this on other operating systems.
The easiest way would be to post in this thread or open an issue on GitHub.
This project was written in a few hours the night the Stack Overflow API was announced. There are probably plenty of bugs or bizarre things in the code. Be kind :-)
The code can be seen and cloned from here: http://github.com/NickPresta/StackTray