My favorite comic about ebooks or ereaders so far was the Mother Goose on 8/21/2010 (I think):
Ralph: "I downloaded a new book at the bookstore today. The author was there and said he'd sign it for no extra charge."
Ralph: "But now I can't read the words because his signature is in the way."
Ralph: "So I guess I'll have to buy another iPad and download his novel again."
Grimm: (Looking sardonic) "Who said publishing’s in trouble?"
(Can be viewed at The Cartoonist Group
here!)