On the other hand, I'd rather have a scanned book than one that's been scanned and OCR'd. OCR seriously messes up older fonts and typesetting.
I've found Nabu better than General, which consolidates the text, drops or uncaptions the illustrations, and changes the pagination. However, most of these reprint companies will reprint v.1 of a set and offer it as if it were complete. Argh.
Um. I guess that was off-topic. Basically, Nabu, General, and the others are all reprint houses specialising in out-of-copyright titles.
-Barbara