Katapult is a quicksilver like application for KDE. Thanks to Chris Rohde for introducing me to it.
Its very easy to get going. Once you have it running, alt-space brings it up. Type the name of the application/document to run/open, and press enter. The first time I started katapult it wouldn't show up in the systray. I wanted to configure it. If this happens, type alt-space, and then Ctrl-C. This should open up the configuration menu, and from their you can configure it to show up in the systray.
I have great hopes for katapult. Hopefully a lot more people will start writing plugins for it.