KRDesktop is a GPL-ed KDE (QT3) front-end for QEMU. It provides a GUI interface for running PC emulation (similiar in intent to Virtual PC/VMWare). Written in Kommander, this also serves as a good example of RAD development under linux.
Make sure you have QEmu and Kommander installed. Any version of QEmu should work, but KQEmu was only tested with the newest Alpha of Kommander.
Simply download and extract to a place of your choosing.
To run: kmdr-executor KQEmu-versionNumber.kmdr (ie: KQEmu-0.2.kmdr)