The Foreign Sales page mentions there's a Dutch translation planned, but doesn't make clear whether it has actually been published. Well, I found it the other day, in a "budget book" box at a nearby drugstore's. "Budget" in this case is just 5 euro. It has of course been on sale in highstreet bookstores, and still is, though at deflated prices; I just didn't spot it.

In case anyone is interested, here are the details:
Title: De zaak Jane Eyre
Author: Jasper Fforde
Publisher: Byblos Boeken, Amsterdam
Year: 2003
ISBN: 90-5847-088-1

Worst translation: 1920 (year of birth of John Standish Fforde, originally 1921)
Best translation: Shakespreek (may be interpreted either as Shake-speak or as Shake's sermon).
The back cover is, unfortunately, written by someone who never read the book.

I'll be glad to supply more info on request.

Greetings,

Delacuesta.