Yes, I also agree that BullZip is fantastic. I'm working with Naomi to evaluate an alternative to Amyuni, which we're ditching primarily because of redistribution license issues and problems with x64 support.

I've evaluated BullZip and BioPDF (the commercial distribution of BullZip) and it is great. Driver support for both x86 and x64, simple API and great results. Under the hood, it uses the GhostScript engine to generate the PDFs. For our implementation, I rejected it solely because it was about 30% slower than Amyuni at appending PDFs together (a requirement of our e-commerce "Print At Home" ticketing). Nevertheless, for basic PDF printing of reports, I highly recommend it.