For my website I created a wrapper of Syntax Highlighter by Alex Gorbatchev. Its a simple plugin that allows you to add Syntax Highlighting to a block of code in wordpress. Can look at any other of my Code Samples to see it actually work.
A user class to handle creating new users, login, logout, and checking if a user is already logged in.
A Chat Server and client that allowed two computers to talk, programmed using C.
Write a program that prints the numbers from 1 to 100. But for multiples of three print “Fizz” instead of the number and for the multiples of five print “Buzz”. For numbers which are multiples of both three and five print “FizzBuzz”."