Whenever something happen which require notification (connecting to a wireless network or low battery status) Ubuntu (unity) gives a nice floating message which (usually) vanishes after several seconds. Is there a way to produce my own floating notification?
Ubuntu – Where can I find documentation for notify-osd
notificationnotify-osd
Related Solutions
Your best bet would be file a bug and ask for the feature. When filing a wishlist bug like this, be sure to give some thought out user cases why this feature could prove to be useful for a larger section of the Ubuntu user community.
This is 
Bug #402962 in notify-osd. It was reported in July 2010, there has been no progress so far.
Since Totem has no option to disable Inhibiting the screensaver completely, there currently isn't a way to work around this bug. Other applications, which have this options, should not cause any problems once it's disabled.
My thanks to DoR for pointing me towards the screen saver.
Best Answer
You can put it in your scripts to notify you about almost anything happens in your system. To see more options like setting title, icons, time, etc...