Debdroid is a fully functional Linux-Android chroot solution. With the ability to set what img file is looped, you are able to run any distro built for ARM.
Backtrack 5 Support!
Backtrack 5 on Android - http://www.youtube.com/watch?v=nYShFr0foS8
Debdroid supports any Android device with loopback devices and ext2.
Succesfully tested on Motorola Atrix, HTC EVO, HTC Incredible.
Release Page: http://gititbit.ch/bt5
All mirrors are provided by gitbrew.org, check out http://gitbrew.org/android/ for more android mirrors. Please contact me if you would like free secure file-hosting.