Hi Nicole
I suggest you can use emoticons as text symbol.
You can copy them from here - http://text-symbols.com/ or http://collarme.forumotion.com/t16-letters-numbers-and-symbols
Currently, they are properly supported in Hotmail, Gmail and Yahoo.
Also, I suggest not to use more than 1-2 emoticons in the subject line as that may affect inbox delivery for the campaign.
Regards
Alok
I'm wondering this myself. Melanie, did you end up testing using emoticons in subject lines?