This one is very good I think
STDIN pitfalls
WAAAAHHHHHH! WAAAAHHHHH!
Pretty sure you can join sourceforge without having to have a project there.
If you do have a OSS project that you want free hosting for, it is not hard to get either.
C programming resources:
GNU C Function and Macro Index -- glibc reference manual
The C Book -- nice online learner guide
Current ISO draft standard
CCAN -- new CPAN like open source library repository
3 (different) GNU debugger tutorials: #1 -- #2 -- #3
cpwiki -- our wiki on sourceforge