Chris,
Are you looking for something to generate PDF documents directly or are
you converting from another format?
Personally, I started with a couple of components that directly built
PDF documents, such as PDFlib and iTextSharp. They were good packages,
as a whole, but I wanted to automate the creation of the PDF documents
for my purposes, so I switched over to generating XSL-FO documents and
generating the PDF documents from that.
If that is an approach that you are considering, I would recommend the
Ibex PDF Creator (
http://www.xmlpdf.com/ibex.html). It is, in my
opinion, the best FO processor out there.
HTH,
Joseph