using 2.3.4, i can't _really_ play music. i can say "play the beatles" and it will offer to search youtube for the beatles, but it won't search the music on my phone.
You got to say "listen to [song/artist/album]". Which, of course, shows one place Siri's got the advantage currently, but I am sure Google is working on that now.
it still won't play my music. i get "complete action with [youtube|subsonic]", but no option to actually play the music on my phone, using the stock music player.