what version of OS X are you running? have you tried the built-in voice control features of OS X? these allow you to open applications, get your mail, tell you the time, or even a joke, all by voice alone. i'm not at my mac right now, but if you're running leopard, go to system preferences and open the speech preferences pane, and select the text-to-speech tab - i think that's where you'll find the controls and list of commands, iirc...