Quick update for Ubuntu 13.04 users: Leolik has updated the patched / configurable NotifyOSD that he maintains, to work with Ubuntu 13.04.
The patched NotifyOSD adds the following features to Ubuntu's notification bubbles (all are optional and can be configured):
- close on click: the notifications can be configured to close when clicked on;
- themes support: change color, width, height, font size, opacity, icon size and more;
- working timeout option ("-t");
- change the notification position: top-right, middle-right, bottom-right, bottom-left, middle-left and top-left corners;
- prevent the notification bubbles from fading out when the mouse pointer hovers over them.