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Dear Mr. Brin,
Have you perhaps considered introducing your child to JavaScript? Sure, it needs a little framework (HTML or XML), but JavaScript has been toted for years as being fairly easy to learn.
I admit I'm a little biased, having written the JavaScript Developer's Dictionary for Sams Publishing (I don't recommend it for people just starting out). Even so, there are applications out there with a standalone JavaScript engine (Mozilla's xpcshell gives you command-line JavaScript access, but you may have to compile Mozilla or get the XULRunner SDK in order to get xpcshell).
Alex Vincent
moderator, XML forum @ http://www.codingforums.com
P.S. I loved "Foundation's Triumph".