I found this link to the GCC Developer's Summit Proceedings on the GCC web site. The proceedings include an article on "Porting GCC to the IBM S/390 platform" by Hartmut Penner and Ulrich Weigand which may be of interest to some people on this forum.
The summit conference page is http://www.gccsummit.org/2003/ and the direct link to the proceedings (1.3M) is http://www.linux.org.uk/~ajh/gcc/gccsummit-2003-proceedings.pdf David Bond - Tachyon Software LLC