Developer Crush Apps has posted a useful list of commands for Siri’s voice-dictation capabilities that should help users solve tricky punctuation problems like how to add ellipses “…” (you can saying “dot dot dot” or “ellipsis”) and how to combine two words into one (you say “no space on,” then the words you want to combine together, then “no space off,” which creates a word like crazycool).
Check out the entire list over on Crush Apps’ blog. A must read if you’re planning on having Siri do a lot of typing for you.