The ADC newsletter for the first time rejected MacPerl as a news item.  Why?  Because: "My manager at Apple pulled it because it doesn't work with Mac OS X."
Sorry, I didn't realize that all Apple developers use Mac OS X exclusively now.  SILLY ME.  We wouldn't want to tell people about cool new software for Mac OS 9; that might make it look like people still use Mac OS 9!  Even though we still support Mac OS 9!  And still warranty computers that don't run Mac OS X at any reasonable speed!