Version: 081 (using KDE KDE 3.5.6)
Installed from: Ubuntu Packages
More interesting than to know a percentage used ( which can also be visually indicated by the bar)
is knowing how much more space there is left on the disk.
In stead of 87% of 90.3 GiB used
Show 11 GiB free space left ( and the bar to indicate the percentage used)
Don't waste space displaying the same thing twice, and requiring some calculation by a user.
(Idea from comments on this article http://arstechnica.com/news.ars/post/20070405-afirst-look-at-dolphin-the-kde-4-file-manager.html )
Fixed in the KDE4 version of Dolphin.