Looking forward to add voice search in your google phone??
well its easy
get the apk from : http://code.google.com/p/goodev/downloads/detail?name=VoiceSearch_2.1.apk
Install.. thats it..
furthermore.. you will be able to find google voice command for 2.2 but it seems they have pulled up the voice search app from the android market..
for installation you need to allow unknown sources in settings -> application -> allow unknown sources