Here is another PHP based PDF generator. It takes simple HTML and converts it. There are some limitations, but if you like table base layouts then this is a good one for you.
Printing webpages is great, but every browser renders a page differently. This can cause problems if you need to be able to print a page that looks the same no matter what platform or browser is being used. Additionally, PDF files can be searched and browsed as a sort of notebook, making it a useful file format for large text files...