I use Shoot 1.6.4
you have to download a speach profile for SHIII in the download section of this site. SHIII.xml
Using the Speech Recognition feature in Windoze XP

combined with the shoot program I get excellent results.
you can get Shoot 1.6.4 here :
http://clans.gameclubcentral.com/shoot/downloads.php
you have to train XP a bit so that it can get use to your accent, etc...
but well worth it...