I was under the impression that the Dragon for Email BlackBerry dictation supported the Tour when it originally launched but turns out it didn’t. Dragon let us know that the Sprint BlackBerry Tour is now officially supported. From what I have been able to ferret out from reviews and other sources there were some issues with certain Tour firmware revisions specifically on Sprint that have since been resolved. Either way Version 1.6.2 is the latest and it was released in the last few days.
If you were holding out on downloading Dragon for Email now might be the time. The app is available through App World for all devices now but only for the major USA carriers.