have you tried exporting as a DXF and then opening it in Illustror?
it should give you some sort of curve I think....
in maya that needs to be turned on ..the DXF export , in order to get the option .
But if you wait a little bit ..or contact David Gould at
http://www.davidgould.com/http://www.davidgould.com/
he is creating an Illustrator , 2d ..,vector, flash exprter /renderer for maya based on his ILLUSTRATE! for max . it should be out soon but perhaps he can send you an early beta ....
I think a compnay called ANIMO has an INKWORKS plugin that will do similar , contact a reseller on that I don;t have the details.
.............