Thanks to Adrian's work on making Debian/sparc64 install media the number of sparc64 systems on popcon has exploded and now sits at 7, currently the same value as arm64. You can see these numbers along with pretty charts at the Debian popularity contest page: http://popcon.debian.org/
To anyone installing Debian/sparc64, consider enabling popcon as it may help sparc64 become a real Debian architecture. Enabling it is as simple as apt-get install popularity-contest. Thanks for your work Adrian and I want you to know that I haven't disappeared. I again have the time to start looking at broken builds only this time from my fancy new Debian/sparc64 install. Thanks! David
