Like most technical professionals, I have for many years maintained a bibliography of references.
Several years ago I converted this to a website and more recently I converted this to a blog. I'm in the process of updating this material again and consolidating it into my blog/website at www.bibliotechnica.blogspot.com . I've started with the C material, in part, because if the blog goes "boom" that is less of a loss - so far things look good. You can find the C references at http://bibliotechnica.blogspot.com/search/label/C. This is a work in progress so I'll be migrating my recommended references on new languages (C++, Java, C#) and other topics (UML2, web services, SOA) as well.