Glad you enjoyed the tutorial.
There's definitely a lot of potential for achieving complex PDF documents programmatically, although beyond a point there's only so much the FPDF library can do. Luckily, you can extend it natively
The example in the tutorial is really rather basic, to be honest, but I tried to explain the fundamentals really clearly so that people can go and create fantastic PDFs. What they do from here is up to them
We're really seeing more sites offer a "download as PDF" option, often very subtly - such as next to the email a friend link on articles. Just a small PDF icon that seems to be gaining in popularity very quickly.
What I really want to see, however, is embedded HTML documents in PDFs, similar to OpenOffice's approach to editable PDFs.