Announcing Two Scoops of Django 1.6 12 years ago
Bought 1.5 ebook, received email about 1.6, no mention of "no ebook" anywhere in email. Found FAQ. Lists reasons why "no ebook" is best for them, not their customers.
I like supporting authors, but not by buying paper books. O'Reilly and PragPub have figured this out which is why I support them.
Edit: Wow, three emails to the list of folks who bought the ebook version of 1.5. The third to email the entire faq out. Self publishing apparently isn't for everyone.