disk full notification?

[Jani Monoses]

Hello

a friend was using warty/gnome and ran into problems with large applications not starting 
anymore. It took her a while to figure out that the disk was almost full.

Wouldn't it be nice to have a notification system included with the default desktop which 
would warn when disk space is scarce?

I know it can be done with various DYO or third party scripts, planel plugins etc.
Searching around a stumbled upon knotify, gnotify and libnotify from galago but those seem 
to target notifications in general and I am not sure what their status is in gnome/kde

thanks
Jani