Version:            (using KDE 4.0.0)
Installed from:    SuSE RPMs

The dolphin group view is extremely useful for organizing files.  However, in certain cases there are large number of files in a certain group while you are only wanting to work with files in other groups both above and below that group.  Having to browse up and down past that group is tedious.  It would be nice if you could select a group heading in a certain way and have that group collapse so items in the group would no longer be visible.  All that would be visible would be the group title and some graphical indication that it has been collapsed.  This would be similar to how you can collapse related groups of songs in Amarok 2.  

I am not sure the best way to indicate the group is collapsed.  Perhaps a stack of icons from the group, or have a border around groups and have the border shrink with a jagged line similar to how Amarok 2 does it.  I am also not sure whether it would be best to have this preserved across sessions.  Personally I would say yes, or have that as an option you can set both globally and for specific folders.  The best way for a user to make it collapse (and expand) again is another question.  I would suggest double-clicking on the group title, a right-click menu item, and perhaps an optional toolbar button.