or more completely:
Voice -> vlingo -> twitter(private) -> OmniFocus
Using the vlingo iPhone app (Free) you can use its voice recognition to post to twitter.
I created a private twitter account and a python script that monitors that account in order to be able to speak new inbox tasks with essentially no fuss (once set up)
http://ptone.com/dablog/2009/03/voic...cus-revisited/
-P