Thank you for the lead - looks good. I found this, which goes into a bit more details for the Rails folks (like me):

http://big-elephants.com/2012-12/pdf-rendering-with-phantomj...

Looks very promising. Open to suggestions if others have better PDF-generating solutions!

What they don't tell you is that this method takes a long time and generates huge files unless you used a patched version of qt. I've been meaning to write a blog post on this.

PhantomJS uses the same mechanism that wkhtmltopdf uses (headless webkit) and thus requires the 'server-side trickery' mentioned by the parent.

Also, the correct link is http://phantomjs.org/