Been programming for coupla' years now. Took some real time to *really* understand C. Unfortunately, me learning C++ is all the harder thanks to some of the C idioms that have been deprecated, but still unfortunately embedded in my head. (wee... I'm a C++ noobie

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Ahem. Anyways, I have lots of bookmarks to different random programming resources. You know, been programming and all.

I tend to shy away from indication of "difficulty" of tutorials. It's way too subjective. So I'll be subjective about it here (I might be wrong on some counts, or whatever):
The Goat Book - A resource for gnu autotools. Very very very very very useful for those working in *nix systems. I use autotools to build my projects nowadays. On a side note, if you use an IDE, you can ignore this, but I find building a project in the terminal with autotools keeps me very close to exactly what is happening as I build the project. Plus, it's standard. Very much suggested for people who like using the terminal as much as I do. (This isn't a programming language, per se, but it does have a complexity of a proper language)
IntermediateStroustrup on C++ - Very helpful to me as I was starting to switch to C++. Plus, it's a page on the language by the language creator. He explains lots of the rationale behind C++ (especially vs. plain vanilla C), and provides a very well done style and technique FAQ.
Beginner-IntermediateC++ FAQ Lite - Wow. This FAQ is amazingly well done and accurately portrays the language. Precise and complete information: something very rare in most language FAQs. Definitely something to look over if you're getting into C++.
Intermediate-AdvancedHow to Program in C++ - A rather quick runthrough of the basics of the C++ language. Probably works best for those who have already learned a programming language, as it moves at a fast pace.
Beginner-IntermediateProgramming in Lua - Pretty much a must-read for aspiring Lua programmers. Competently and consistently well done introduction to the Lua programming language that just rules. Unlike lots of beginner guides, this one doesn't dumb down concepts. Tells it as it is. Yay. I liked lua a lot.
Beginner-IntermediateC Style and Coding Guide - I liked this guide. Has some dated information, but lots of it is still relevant, methinks.
IntermediateC++ Optimization Guide - Doesn't try to be fancy. Most of the tips in it are just good coding style, anyways (style + speed = win). Does have some arcane optimization trix, but those are in a section of its own, and the author does warn against using them. Gives you good things to keep in mind while coding.
Intermediate-Advanced