Well, there are the French/German style quotes that look like << and >>... but Perl 6 uses them (believe it or not!).

You can't use anything other than paren, bracket, brace, or angle-bracket in Perl right now to balance, since they're hardcoded into the parser/tokenizer. But you could certainly choose some obscure unicode character that doesn't need balancing. Actually, if you could tell the parser to include a pair of your own, like ` and ', that'd be cool.

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Jeff[japhy]Pinyan: Perl, regex, and perl hacker, who'd like a job (NYC-area)
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;