Quite a few months ago, someone (Kovid?) mentioned that incorporating ebook editing capabilities into calibre was somewhere on the todo list. Is that still something on the drawing boards?

I'm one of the compulsive types who'd like to be able to correct spelling, punctuation, and formatting errors in his non-DRMd ebooks and such a capability would make calibre an even more superlative piece of software.

You can use sigil to edit EPUB files. Editing other formats doesn't make much sense, since they're not really designed to be editable.

I would have thought Sigil was the way to go for editing epub files?

Oops typo, I meant sigil