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For example:

theassayer.org

freetechbooks.com

Ummm...some text books already are free...if you have a computer...like an OLPC XO, for example...:-)

http://freetechbooks.com/

And considering the XO uses Python, perhaps start by looking at this list:
http://freetechbooks.com/python-f6.html

There are many, many more examples, and more popping up all the time. At all levels. In all subjects. In many languages. I'd suggest doing some research/thinking before spouting off about how kids need books rather than computers. Ideally both, but given the choice between books and computers, I'll give a kid an internet capable computer in a flash (pun intended).
Seen any good movies/videos/howto's in a book lately? :-) Listened to any music in a book lately? Taken any photos with a book lately? Written a book, with a book lately?

Flood them with OLPC XO's...books are limited by how many you have, etc. You have far, far more access to far, far more topics, information, etc. with an internet computer than ANY library of books. Whadda ya gonna do, get them perhaps 5 textbooks each? On 5 topics only? This is your preference for poor kids???!!! GET REAL!
Give them internet computers, preferably linux based, and get out of their way.

Ummm...some text books already are free...if you have a computer...like an OLPC XO, for example...:-)

http://freetechbooks.com/

And considering the XO uses Python, perhaps start by looking at this list:
http://freetechbooks.com/python-f6.html

There are many, many more examples, and more popping up all the time. At all levels. In all subjects. In many languages. I'd suggest doing some research/thinking before spouting off about how kids need books rather than computers. Ideally both, but given the choice between books and computers, I'll give a kid an internet capable computer in a flash (pun intended).
Seen any good movies/videos/howto's in a book lately? :-) Listened to any music in a book lately? Taken any photos with a book lately? Written a book, with a book lately?

Flood them with OLPC XO's...books are limited by how many you have, etc. You have far, far more access to far, far more topics, information, etc. with an internet computer than ANY library of books. Whadda ya gonna do, get them perhaps 5 textbooks each? On 5 topics only? This is your preference for poor kids???!!! GET REAL!
Give them internet computers, preferably linux based, and get out of their way.

Amen to that!

And with stuff like http://freetechbooks.com/freetechbooks for instance and the http://ocw.mit.edu/MIT openCourseware it really is beside the point whether you get credit or a "real-life" experience, whoever derives whatever value from this resource do so for their specific reasons and their specific conditions and circumstances and therefore this sharing of valuable life tools need to be commended

I agree with these book selections though I think that it's wrong to say "these are must-haves for the Linux/Unix user" if they cost money. That's because Linux should be free, you shouldn't 'need' to drop $200 to be proficient in it. You need to invest time but not money.

Perhaps there are free resources out there.

You mean like this, or this? Those are just the two I happen to have bookmarked. I'm pretty sure there're a few more out there. Admittedly, not everything they link to is in PDF format, but a lot of it is.

Clipper 5.0 was already extensible back in 1991.

Using a meta-language you could define new syntactic constructs.

Lisp is extensible, read On Lisp, Advanced Techniques for Common Lisp.

Heck, if you do your homework you can probably even extend Perl with new constructs, making use of the BEGIN, CHECK and INIT block constructs.