Eating Your Own Dog Food
XML and markup technologies are a wonderful thing, but only lately has the author had the confidence to really and truly eat his own dog food, trusting entirely on the technologies familiar to him. He's learned to ignore the calls for real programmers while discovering how to copy and paste from Stack Overflow and the like in moderation. XForms, XQuery, XSLT, XSL-FO, and a proper XML database might just be all you need, at least if you know how to Google and ask for help.
This, then, is nominally about building a conference registration application ensuring that we get paid for every delegate, but really all about the fact that we can now rule the world without bothering with the programmers.