I'm a punctuation nut. When others argue against the Oxford comma or the semicolon, I get personally offended. So I love this list of 14 punctuation marks you might not have heard of. (If you're in the writing/editing world, I bet you can pick out at least a couple.)
The Exclamation Comma. Finally, a way for me to express excitement without ending a sentence! The Snark is also wickedly delightful, but I think I'd end up using it too often.