have browser, will travel
Instant Python, by Magnus Lie Hetland. This is a great mini-tutorial that cuts to the chase immediately, and doesn't stop until after it thinks it's finished.
I think I learned the essential Python in just 15 minutes! Yes! Thanks Magnus!
Free idea: people should get together, write similar documents for all programming languages (okay, say the top 30 or so) and put them into an O'Reilly book.