There's a new update, 1.10d, available for The Keep:
This new build of the Keep can export text and image topics to EPUB formatted eBooks, for reading on eReaders and tablets such as the Nook, iPad, Sony Reader, and the Kindle (with further processing). This support is experimental!
As such, this is considered a Beta release - you should only download this if this new feature appeals to you.
I dont have access to a wide variety of eReaders, so if you do create eBooks with the Keep, please let me know how they work on the devices you try them on.
You can assign a cover image by placing an image entry as the first 'child' under the root topic. The first image entry found will be used as the ebook cover. So your book should look like this:
Be aware that table rendering on most eReaders is fairly rudimentary, so topics with complex or wide tables may not display well.
The eBooks created by the Keep ignore the base selected font you have assigned (though bolding and other formatting still apply). Most eReader devices ignore font faces anyways, and use their own built in fonts.
Titles and Authors are required by the file format. Books without them may not load in eReaders. The book id will be generated for you if you leave the field blank. Though if on the remote chance you happen to have an isbn for your book, you can assign that as the id.
The Kindle, unlike most eReaders, does not support the EPUB format. But Amazon has a tool called KindleGen which will convert an EPUB book into a .Mobi book for use on the Kindle. I have not tried the conversion process yet, but if you do let me know how it goes. You should also be able to email your .epub book to your kindle's email address, and the conversion will be done automatically.
PDF's, Maps, and others
The Keep can only export Text entries (including log entries) and images into EPUB books. Maps, PDFs, Character Sheets, and other types of entries will not be exported. They will simply be ignored. There's no intention to have it support PDF's, as thats simply not a document type epub supports, but I may expand the support to maps and character sheets in the future (by converting them to images first).