digiKam from KDE3 branch : new text filters have been added to the bottom of left and right sidebars. View listed below can be filtered:
- Album folder view.
- Tags folder view.
- Search folder view
- Tags Filter folder view.

When user type a string, a search is performed to tree view contents and only items including the strings are displayed.
A screenshot of digiKam in action is available at this url:

<a href="/issues/2007-12-02/files/digikam0.9.3-searchfolderbar.png">http://digikam3rdparty.free.fr/Screenshots/digikam0.9.3-searchfolderbar.png</a>;