Version:           4.00.85 (KDE 4.0.85 (KDE 4.1 >= 20080703)) (using 4.00.85 (KDE 4.0.85 (KDE 4.1 >= 20080703)), compiled sources)
Compiler:          gcc
OS:                Linux (x86_64) release 2.6.24-19-generic

In the huge list of search engines available for konqueror there's no youtube search engine, which i think is very useful.
Someone (Malte Dik) wrote a youtube plugin and uploaded it on kde-apps.org (it is GPL), here's the link: http://kde-apps.org/content/show.php/Konqueror+webshortcut+for+Youtube?content=72320

and the text of the yt.desktop file:

[Desktop Entry]
Charset=UTF8
Hidden=false
Keys=yt
Name=Youtube
Query=http://www.youtube.com/results?search_query=\\{@}&search=Search
ServiceTypes=SearchProvider
Type=Service

I think is really a junior job that could improve usability