I use Google's default voice input all the time, for texting and navigation and searching and such. Previously, if a scenario arose when I needed to include a symbol (such as an exclamation point!) or a special case, like a smiley face ":-)", I simply said these into the voice input:
text mom i love you exclamation point smiley face
used to yield
Text to: Mom Message: I love you! :-)
Text to: Mom Message: i love you exclamation point smiley face
I noticed the change after upgrading to ICS (AOKP, latest builds) but realized the issue now happens across OS usage, which I would attribute to Google's interpretation methods changing. Does anyone else have this problem or know how to fix it? I loved this feature!