Hi Alex
my recollection is that Langer was done for contempt of court for breaching what was probably a dubious injunction that acted to suppress his rights to vote as he pleased, including clearly expressing a non-opinion on the merits of the various candidates
It is also my recollection that after Langer's advocacy the Commonwealth Electoral Act was changed to automatically count a "Langer vote" -- voting 1-2-3-3-3, etc -- as an informal vote. To be formal a House of Reps vote must be numbered consecutively -- I'm not sure if using prime numbers 1-2-3-5-7-11, etc or a Fibonacci sequence (1-2-3-5-8, etc) would constitute a formal vote.
Might be interesting to give it a try.
As to senate voting -- Damien's post #27 -- numbering the Senate boxes above the line gave back to the voter the ability to assign preferences as they wished -- rather than have those preferences distributed as was agreed by "back-room party deals".