Qemu in Debian
Debian provides a package for qemu. As usually, you can install it using:
apt-get install qemu
If you still use Debian etch, and you need a more recent version of qemu, you might be interested in using Backports.
See also:
Debian qemu wiki page.
Debian qemu package information.
Using qemu to test Debian-Installer under various hardware configurations - DebianInstaller/Qemu
See http://qemu-buch.de/d/Installation and http://qemu-buch.de/d/QEMU%2BKQEMU_unter_Linux for further information.
Hosted by http://qemu-buch.de