If you want to follow your reputation points in the KDE system tray, you might want to take a look at the BitBucket page of the StackOverflow KDE System Tray:
You just need to set
USER_PAGE to your StackOverflow profile page and start it.
And because it was not a question up to this point: What do you suggest how the program could be optimized? So far it definitely does not support Jon Skeet's rep points because of the size limitations.
EDIT: With unicode support and dynamic font scaling (Jon Skeet support)