Speaking the song title of the next song to be played would kind of be annoying. I don't see much point in getting TTS working and having a wave file per FID. Imagine hearing the track names spoken in between the tracks of "Dark Side of the Moon". Ick.

On the other hand, TTS for browsing the Playlists would be rad. I believe that would take a change to the player software, though. It would be weird to hear the menu being spoken over a song, though. A TTS enable/disable function would be needed, because sometimes you would like to hear the TTS while browsing the menu (picking playlists on the fly) and other times you don't (EQ settings, etc.). I could even see an option of pausing the current playback while browsing with TTS.