Check File - Determine if a file exists, and if you have read / write permission.
Hangman - The ever popular Hangman C Code, this is now fully Linux compatible.
List Directory - List the contents of a directory (recursively).
Updates
27-Nov-2007 Looking through the code that was bit rotting on the site, I have come to the conclusion that much of it can be improved. Taking into consideration the code was written 6-7years ago I have learnt a lot since then. I am therefore currently rewriting (for the better) all of the code that was on the site, any code that is deemed wastefully will be removed.