Lambda the Ultimate

A book on the Racket programming language Is being proposed by a potential author. He would 'greatly appreciate answers to this survey:'
http://www.surveymonkey.com/s/MKQL3YX

He dropped this link on reddit and 'Ask HN' looking for feedback, but I'm keen on the idea myself, and I thought post it as the readers here would have read a PL book or two.

He is also tracking the forums:
• Ask HN: Would you like to see a book on Racket?
• Interested in Racket? Want to see a book on it? Fill out this survey.