One of the additional presentations that I was waiting for arrived today, and it's been uploaded to linuxvm.org. It was session 5534 by Doctor Robinson titled "Linux z/900 at Salomon Smith Barney." They have Linux/390 in production doing some infrastructure work, with plans to migrate applications to the platform.
http://linuxvm.org/present/index.html or http://linuxvm.org/present/SHARE98/S5534dr.pdf Mark Post
