In working with org-mode's taskjuggler exporter, I have noticed that it does not support the attributes chargeset and charge in taskjuggler 3. These attributes are necessary to use taskjuggler's cost estimating functions. I am not much of a coder, but I have tried my hand at a patch.
commit 15b522901ff0dcd8a581ad55cd4bf4c3688908ad Author: Bill Day <address@hidden> Date: Sun Aug 26 16:58:32 2012 -0400