I'm one of the developers working on the Mangler project.
It may interest you to know that work is underway to port Mangler to the android platform. The library that drives Mangler (libventrilo3) already successfully runs on the Android device as a shared lib compiled with the Android NDK.
I am currently in the process of trying to write up a decent GUI for it, and in the near future will start looking into audio encoding possibilities (speex/gsm). I am a C coder by nature, so any help to speed up the development process is always appreciated.
You can find us either on our homepage (Mangler | A Ventrilo Compatible Client for Linux
Or on IRC: