Wow. 2.2.0 looks good.

"A separate HTML page for each book" is nice too, though, imho, needs some kind of cover resizing. (Especially Kindle's browser doesn't handle bigger-than-kindlescreen size pictures well and crashes a lot with big pages.)
Covers are big and in various sizes. Many of them are not fit for a 6-inch screen and are up to a couple of hundreds bytes. I tested with Amazon's original eBooks stored in calibre, auto-generated covers. I didn't know covers are that big. And Bandwidth-wise, it would not be a problem for Wi-Fi devices I guess, but is to devices with 3G network - like Kindle.
I wish there is a way to limit the size or have a option to use the cover images from "Browse by cover" or "All Books" in "A separate HTML page for each book" page.
And again, great work! Thanks.