Note: This article is part of my Testing stuff with QEMU series.
From the Debian GNU/kFreeBSD port page:
Debian GNU/kFreeBSD is a port that consists of GNU userland using the GNU C library on top of FreeBSD's kernel, coupled with the regular Debian package set.
Q: Why would anybody want to do that?
A: Why not? 
So, after we have talked about that, let's start:
apt-get install qemu
qemu-img create -f qcow2 qemu_kfreebsd_i386.img 5G
qemu -boot d -cdrom debian-20070313-kfreebsd-i386-install.iso -hda qemu_kfreebsd_i386.img
ALT-F3. Do it.
At the end you must select "No" as you're told to do, then reboot via "Exit Install". You can then shutdown QEMU.
qemu -hda qemu_kfreebsd_i386.img
apt-get update && apt-get dist-upgrade
apt-get install vim xorg icewm xterm
apt-get install kbdcontrol
Section "InputDevice" Option "Device" "/dev/psm0" Option "Protocol" "PS/2" [...] Section "Device" Driver "vesa"
Both kfrebsd-i386 and kfreebsd-amd64 seem to be reasonably stable already (and more than 70% of the whole Debian archive builds fine on these architectures, see kfreebsd-i386_stats and kfreebsd-amd64_stats). I'll quite likely install kfreebsd-amd64 on one of my boxes soonish and start using it, maybe I'll even find some time to fix/patch/port some packages...
 More elaborate answer(s) and reasons are available in the Debian wiki.
This is really sad in my opinion, as we should rather support more architectures instead of less architectures. After all, Debian is "The Universal Operating System" .
Now, I know that my opinion doesn't matter much in this case, but many other people who own sparc32 boxes seem to feel the same, judging from the thread which was started by the announcement.
Also, I do realize that nobody wants to retire the port just for fun. To my understanding there is one major problem which needs to be sorted out in order to "save" the sparc32 support in Debian (and also in Linux!):
There is no Linux kernel maintainer for the sparc32 Linux code at the moment!
This seems to be the root of the whole problem. It makes maintaining a Debian port for sparc32 really hard, as you can surely imagine. Also, there seem to be too few people who actively work on the surrounding toolchain stuff (gcc, binutils, etc) which is also very important.
My suggestion would be to not drop the Debian support for now, but rather set the status to "needs help" or something and actively search for contributors and/or maintainers. Heck, list it on Unmaintained Free Software, or write a "call for help" Slashdot article, post the issue on all Linux-/Debian-/SPARC-related mailing lists etc. etc. (or write funny blog posts, heh).
I guess if two or three experienced SPARC developers would step up and take care of the kernel and toolchain maintenance for sparc32, there would be no reason to drop it anytime soon.
To quote O'Reilly:
Written by a leading developer and maintainer of the Linux kernel, Linux Kernel in a Nutshell is a comprehensive overview of kernel configuration and building, a critical task for Linux users and administrators.
No distribution can provide a Linux kernel that meets all users' needs. Computers big and small have special requirements that require reconfiguring and rebuilding the kernel. Whether you are trying to get sound, wireless support, and power management working on a laptop or incorporating enterprise features such as logical volume management on a large server, you can benefit from the insights in this book.
Linux Kernel in a Nutshell covers the entire range of kernel tasks, starting with downloading the source and making sure that the kernel is in sync with the versions of the tools you need. In addition to configuration and installation steps, the book offers reference material and discussions of related topics such as control of kernel options at runtime.
A key benefit of the book is a chapter on determining exactly what drivers are needed for your hardware. Also included are recipes that list what you need to do to accomplish a wide range of popular tasks.
It's yet another great book licensed under a Creative Commons license. It's good to see that more and more books are now being freely licensed...
Enough spamming, back to work.
apt-get install sun-java5-jdk(and a few other packages) in Debian, as Sun has finally relaxed its license a bit. Note that it's still not free, it's just free enough to be distributed in Debian's non-free section now ;-)