Just upgraded my Mac mini I use as a media center to find out that the new Front Row does not stream to remote AirTunes speakers as it did in Mac OS X 10.4 Tiger. Front Row sound goes only to audio out, which is connected to the TV. One more thing: the music stops when leaving the Music menu in Front Row. Mac OS X 10.5.1 update does not fix these problems. Apple Support Discussions thread is here.