Generating pdf with php

There exists very little open source options for generating pdf with php but http://fpdf.org
is one easy to use and both IE and firefox compatible open source solution available which generates pdf files with pure php so its very easy to setup on your server.
The author claims that although the generation speed of the document is less than with PDFlib
but there is very small difference for small and medium sized pdf documents.
The site has good tutorials for beginners and manual for all the functions.