Would I buy the author a beer at a con, yes, so I dropped $3 at amazon for the kindle version. That's about what its worth.

Problems:

1) Is it for noobs or the guy learning his 10th language? Starts with "what is a file, what is a folder, what is a text editor". Then leaps into a very matter of fact "and this is how you do recursion". So a noob is going to be totally lost after the first chapters and an old timer is going to be pretty bored with the "what is a folder" level stuff.

2) Strange text encoding errors on the site. ... Bullet point "Strings are" a-hat (as in a with top hat, not ahat) lowercase-epsilon c-concat-e "indexed" a-hat epsilon "starting at 0 not 1" ... current firefox if that matters (which it absolutely shouldn't)

Other than that, its a pretty good intro level book, like I wrote I'd "buy the author a beer" level of goodness.