For those who are into modding, Id like to take a moment to point out quite possibly the best resource I have ever seen for GoldSrc, Source Engine, Source2, and SFM content. A massive list of links for tutorials, tools and also notably, archive.org links to long dead sites that previously were forgotten.
http://www.sourcemodding.com/
Furthermore, there is a submit form or email submit for if you have any archived links or tutorials you may have not seen there. Ive already got some of my site tutorials there as well.