I am sure I asked some while ago if it was possible to configure a quiz results block so that student names don't show, but I can't find it. Anyway, here is a simple revision that allows toggling between student ID# (order registered) and student name. The student userid does not link to anything, but it could just as well say "Anonymous" or "Guess Who" or anything else (see blocks/quiz_results/block_quiz_results.php). It is defaulted to use ID so you don't get names unexpectedly.
Could someone "higher up" please check this and add a finalized version to CVS if it seems like a desirable feature? Note that after unzipping you have to copy the lang/en/block_quiz_results.php to the corresponding moodle location.