http://forum.xda-developers.com/showthread.php?t=1444792 opens some possibilities up so thought i would share.
Native GNU/Linux Linux programs for you android
This was always possible and done of course, all the OpenVPN apps for example are just front-ends for native binaries, but it does look nice to have a script. Neat.
edit:
Oooh, rsync, finally a decent way to backup my phone without copying everything over slow wifi or slow usb. 