C0 Language

• C0 language tutorial
• C0 language reference
• C0 library reference

C Language

• C Language Tutorial -- one of many C tutorials on the Internet
• The C Library Reference Guide -- a reference on the C language and its standard library
• comp.lang.c Frequently Asked Questions -- a FAQ covering many of C's dark corners and idiosyncrasies

The VIM text editor

• VIM Commands
• A useful vimrc -- add these lines to your .vimrc file for syntax highlighting and smart indenting

Style Guide

• Style guide