Karmic ships the GNUmed electronic medical record application. Both the client and the server part are included. Jaunty shipped a buggy version which would (user approved) call home and report the bug. That way we had a feeling how many people attempted to use GNUmed.
Karmic ships GNUmed client 0.4 series which is a lot more stable. So far noone has called home. That either means that GNUmed is indeed stable or noone is trying it :-)
As far as I know there are no statistics available on the downloads of the packages. Even the PPA don't have the feature unless I have missed something.
It is a little sad to be left in the dark how many people are looking at GNUmed.