GStreamer playing an MP3 on my N900 through a pipeline using the goom visualisation element, including TV-Out. The N900 as a party animal! This uses the default framework of Maemo 5, no additional codecs needed. Hopefully soon in a free app somewhere.
(Disclaimer: the TV image flickers on my video because of sync issues between PAL and my Canon Digicam. In reality, T-Out on the N900 is rock solid.) (less info)