aba@spohr:~$ madison glibc
     glibc | 2.2.5-11.8 |     oldstable | source
     glibc | 2.3.2.ds1-22 |        stable | source
     glibc |    2.3.5-6 |       testing | source
     glibc |    2.3.5-6 |      unstable | source
Thanks, Anthony and Steve for hand-"holding" it in. It worked. Now let's see how fast we can sort out the remaining issues (xorg-x11, gcc-4.0, ...). In other words, this is not a "let's break unstable again"-call, but rather "we progressed by one step, let's do some more steps now"-one.