My first worry was that the faac element doesn't implement the tagging interface, so I may have AAC data but there is no track information. I then noticed that file wasn't identifying the files as AAC, but as just data. Starting to panic, I dived into #gstreamer and discovered some bad news. By setting an option on the encoder (outputformat=1) I get AAC data that is recognised, and Xine will play it, but it's not wrapped in a Quicktime container so can't be tagged and probably won't play on an iPod.

This is my challenge. If someone can write enough of a Qt muxer that supports tagging so that straight from Sound Juicer I can create .m4a files that play on my iPod without any hassle, I'll give you a free Sound Juicer t-shirt and my eternal gratitude. Anyone interested?

NP: Remembranza, Murcof. Yes, again, it's great.