Fantastic plug-in!
I had an idea for a feature: Would it be possible to list the number of *unique* words, i.e., so you can see how many actual different words are in a book? I'm currently learning German, and I have a bunch of children's ebooks, with varying levels of vocabulary. If I could go through them from the most limited vocabulary to the largest, I think it'd be awesome. It'd be great for other language learners as well, and also be very telling about which writers use the most verbal variety.
