I will also be trying this on the Nexus S. If you are able to get this working on other Android devices, please comment below. I would say that this works on most Android devices because the instructions I have read does not list any specific device. Good luck and have fun!
I often get asked if I use S-Voice. To be honest, I have only used to make appointments on my calendar. I have used it to launch google music but that was just for testing. I have used it to launch Pandora and it works really well. Especially because Pandora just starts playing songs after launch. So all I have to do is say Pandora. But then I thought about that fact that I still have to press the S-Voice App once and that is equivalent to pressing Pandora just once too. So honestly I am not saving a darn thing.