On the occasion of wikipedias 2,000,000st article I like to post some information:

These are the best knowen wikis (and those with the best / most information and community)
EN-Wiki: 2,001,607 articles
DE-Wiki: 0,636,354 articles
FR-Wiki: 0,555,167 articles

but there are other wiki-projects:
WikiBooks: Wikibooks aims to build a collection of free e-book resources, including textbooks, language courses, manuals, and annotated public domain books. It aims to help both (self-)instruction of students, and teachers in high-schools and universities.
Wiktionary: multilingual dictionary with definitions, etymologies, pronunciations, sample quotations, synonyms, antonyms and translations
WikiNews: The name says it all

The most interesting one for you guys will be wikibooks, because of these articles (I just saw them, I don't know anything about the quality, but I'll read the german ones):
English:
Cryptography
Reverse_Engineering
Javascript - I think selfhtml will be better...
Flash_Basics
Applets
Physics: Movement - perhaps for science 9?
Programming languages

German:
Cryptography
Applets
C++
physics

the article/book on reverse engineering is pretty decent,

there a few things that aren't as fleshed out as they could be.

For example packed executables is only touched on very lightly, and you sometimes have to read between the lines a bit.

For example the book mentions a lot of tools, but not a single pe-file identifier. like PEID is mentioned.

and it doesn't mention other advanced things for example on how to recognise c++ class virtual tables and other structures.

But all in all it's a must read, if you just can't seem to get any of the non trivial challenges. You can even skip all the linux stuff
for that

nice list moose