A follow up to a long-ago post… The coolest symbol now has extended support from Microsoft. The interrobang (a combo of the question and exclamation marks) now has characters is many of the default fonts in Windows that use Unicode (Lucinda Sans, Arial, Palatino, etc..)
If only it would come into common usage. It needs to be included on cell phones for text messaging, or in IM clients.
You Know What Part 