This script is an adaption of the guestbook script. 
This program requires three files:

1. A web page the form will be placed onto.

2. notes.php3 
The actual script the form calls. Place in the folder /notes.

3. notes.txt 
The file new entries are saved too. Place in the folder /notes.

Instructions are included in the top of the text file: notes.php3 

See a real example at bottom of the PHP intro page.
http://tvsecure.net/manual/php/notes/exampleform.html

Grab the files: 
http://,aricure.net/manual/php/notes/files/