No hubris is greater or more despised by the gods than that of a man who believes he has written a robust curve offsetting algorithm.
My offsetting algorithm is still giving me problems, but I do feel slightly better that when I tried the latest edge-case in #Rhino3D to see how they handle it I get exactly the same result as from my own crappy code: 
If you can't be right, at least be wrong in company.
In fairness to both myself and McNeel; it's not entirely obvious what the correct behaviour here actually is. When you get right down to it, what exactly constitutes an 'offset curve' is a bit fuzzily defined and there's several ways of approaching it.
Fixed it! Stay tuned to hear how the horrible hacky bodge that I used comes back to bite me in the butt in a few days...
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