After mainly using FTDI's sound modul VMUSIC2 up to now, i put my attention to new SOMO-14D from Australia: http://www.4dsystems.com.au/prod.php?id=73
Price is much lower. It's not allowing HI-FI stereo sound, but should be OK for any sorts of announcements. It's using AD4 format sound files stored on standard Micro SD memory card. There also is software for converting from MP3- or WAV format.
Klaus
