Someone asked about the Perl memory leak I spotted. Rather than try to put code into a /msg, I'll just include it here, that way anyone can point out that I'm mistaken. From line 3113 of op.c, Perl v5.8.0:
repointer = newSViv(0); av_push(PL_regex_padav,SvREFCNT_inc(repointer));
newSViv() gives a ref count of 1. av_push() doesn't change ref count so the SvREFCNT_inc() leaves a ref count of 2 but repointer is not subsequently used so we've made one reference to it so we've got a memory leak.
I'm hoping the person who asked will perlbug this and save me the bother (not talking to p5p is always an advantage, IMO), but we'll see what happens. :)