Standard Ebooks new releases
The volunteers at Standard Ebooks produce cleaned-up, formatted, public domain texts as ebooks (with cover art, too, although the art only loads on my Kindle if I send the book and cover via USB).
Their new releases RSS feed is a joy to subscribe to. Every few days, you get a title, art, and description of a book from years ago. I've only read one of them, but the better me might read a few more someday.
Update: I notice that Bookshop.org now offers ebooks, including Standard Ebooks .