my own overuse of "?!" punctuation reminds me of a punctuation mark introduced in 1962, which hasn't really caught on (but I remain ever hopeful)...

interrobang - a punctuation mark designed for use especially at the end of an exclamatory rhetorical question, comprising an exclamation point superimposed on a question mark. [this can only be approximated with the standard keyboard as: isn't that a great idea?!]

here's a swell graphic:
http://www.interrobang-mks.com/