divx plugins

Nope,
main reason for the non existing plugin is that there are no (in TD) libraries for handling the divx xvid encoded video.

You can only play mpeg2 video and mp3 encoded music.
Other meadia formats (audio, video - ogg, wma;xvid - ARE NOT supported by the TD firmware at all).

For example icecast plug-in for playing internet radio is able to play only mp3 encoded streams.
Other types are not supported thanks to missing libraries and functions (asf, ra ...).

Bye

You can compile your own libavcodec and upload it to /var/lib then write a plugin. But it will run very very slow because the processor can't handle the decoding. Your best bet is to transcode the divx to mpeg2.