In this list is still active... :-)

FYI, at the July GCC Cauldron conference, the AdaCore CEO talked about 
their GPL-based business model.

Excerpt from <http://gcc.gnu.org/wiki/cauldron2012>:
----ship----
Free Software: A viable model for Commercial Success
Presenter: Robert Dewar

This talk will discuss our experience at AdaCore, one of only a handful 
of 100% Free Software companies. All of our commercial products are 
licensed under the GPL and other Free Software Licenses. People often 
assume that there is a conflict between the use of such licenses and the 
needs of a commercial software company. Our experience at AdaCore shows 
that on the contrary, the Free Software model can be very successful 
both for us as a company and for our customers. We think this model can 
be used in many other circumstances, and want to encourage free software 
enthusiasts to consider this model in other circumstances.

Slides: 
<http://gcc.gnu.org/wiki/cauldron2012?action=AttachFile&do=get&target=dewar.pdf>

Video: part 1: <http://youtu.be/PwRUk7KD8mc>,
part 2: <http://youtu.be/jrw17nLqRXc>

Video of the talk: <http://www.youtube.com/watch?v=PwRUk7KD8mc>
----snip----