I'm teaching myself C as a first programming language. Anyone interested in doing the same and looking for advice, please feel welcome to contact me. Reading/Referencing the following material has been useful to me in my journey.

Recommended Material:

Books:

C Programming Language (2nd Edition)

The C Answer Book: Solutions to the Exercises in 'The C Programming Language,' Second Edition

Write Great Code: Volume 1: Understanding the Machine

Structured Computer Organization (5th/6th Edition)

Code Complete: A Practical Handbook of Software Construction

The Linux Programming Interface: A Linux and UNIX System Programming Handbook

Videos:

C Programming 2007 Tutorials

Slides:

Deep C (and C++)