Are you a programmer and you want to have a really easy way to make a Documentation of your project? Then, i recomment to you Doxygen. It generates a very good locking documentary from comments in your sourcecode. Through custom commands you write in your sourcecode comments you can control the output of the documentary generator.
It is easy to install, works with many programming languages and has a great GUI with an automatic help box. So enjoy documenting code again : www.doxygen.org