This appears to be a really nice tutorial book about Javascript
programming, including a "console" and active content right in the
book.

http://eloquentjavascript.net/

Sorry, this is really off-topic, but I have been playing with
Javascript for a while
(http://home.roadrunner.com/~thefaughts/croquetscape/canvascape.html)
and now I'm starting to look at it more seriously, partly because of
Clamato and the Lively Kernel, and partly because I'm interested in
doing some Functional Programming, which this book covers.  Although
it's not a "pure" FP language, I hope to get some mileage (or
kilometerage?) out of Javascript in that regard.  I have played with
Clean enough to be dangerous, so I have an idea of the syntactical
differences.

Enjoy!
Dave