I think this may be a bit more understandable (as it uses one fewer tricks): 
sub zip {
    my $half = @_>>1;
    return @_[map { ($_&1 && $half) + ($_>>1) } 0 .. $#_];
}

[download]
or 
sub zip {
    my $half = @_>>1;
    return @_[map { $_, $_+$half } 0 .. $half-1];
}

[download]

p.s. A common name for this kind of functionality is "zip". See Language::Functional for an implementation. SO I changed the name for the function to reflect this.

In reply to Re: perfect shuffle by bart
in thread interleave (single shuffle) by ysth

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