Would it be that difficult to write a LAME mp3 encoder component? I believe that there would be a lot of demand for it.
An AC3 decoder would be good too.
How long until the Speex component will be available?
Oh, I forgot the most uiseful one: an Xvid component...
I've been looking into using the FMOD libraries (www.fmod.org) in some sort of a plugin architecture -- if we could get this working, it would let QT (and by extension, programs like iTunes) read MOD, XM, S3M and IT files. Using FMOD should also allow for a bit more, as it has built in DSP calls and can also read mp3, aiff, wav, ogg, and redbook audio. Of course, I have no idea how to link a quicktime plugin to an external library, but Apple already does something similar with MIDI.