Another favorite higher order function of mine is right curry:

sub rcurry {
    my ($f, @args) = @_;
    return sub { $f->(@_, @args) };
}

*company_name = &rcurry(\&wrap_with_html, "FoxTrotUniform Inc.");

print company_name('B');
print company_name('I');
print company_name('H1');
[download]

And these are nice function builders from Dylan.

sub conjoin {
    my ($f, $f2) = @_;
    return sub { $f->(@_) && $f2->(@_) }
}

sub disjoin {
    my ($f, $f2) = @_;
    return sub { $f->(@_) || $f2->(@_) }
}

*company_name_better = disjoin(
     conjoin(
         sub { return 1 if scalar @_ == 0 },
         curry(\&company_name, 'H1')
     ),
     \&company_name
);

print company_name_better('B');
print company_name_better();
[download]

And of course, if you really want to make your head spin, there is always combinators.

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