PDFCreator is a free tool to create PDF files from nearly any Windows application.

Key Features:
Create PDFs from any program that is able to print
Security: Encrypt PDFs and protect them from being opened, printed etc.
Send generated files via eMail
Create more than just PDFs: PNG, JPG, TIFF, BMP, PCX, PS, EPS
AutoSave files to folders and filenames based on Tags like Username, Computername, Date, Time etc.
Merge multiple files into one PDF
Easy Install: Just say what you want and everything is installed
Terminal Server: PDFCreator also runs on Terminal Servers without problems