Yeah, someone on the french blog has asked for an english spanish dictionaries.
Perhaps should you advertise for the Penelope project on their english blog.
It's well documented and very useful if there are dictionaries in the corresponding language.
I fear that there will have no commercial dictionaries available as the dictionary is not protected (I'm a user of free software since a long time but there is no free dictionary equivalent to commercial english-french dictionary).
So, people will have to use free dictionaries (especially Stardict) and would appreciate your work if Booken don't provide one for their language (or the one they want).
Other people might also want to adapt a dictionary provided in another format (for example, html or mobi). Your documentation would be very useful in that case.
So, a little publicity for your work and your project could be very appreciate for the Odyssey's users.