Apiary now has a print stylesheet for the generated Docs.
It uses numbering + table of contents and displays the examples with language you have selected in the language-dropdown.
The preferred way of sharing the documentation with 3rd-parties is through People settings (add viewers). However printing now looks great.
Feel free to comment.Justin Whitehead commented
Just created an account to try Apiary out. First thing, yes, first thing I am looking for is ability to export to a PDF. Didn't see any native export functionality. Reiterating some prior comments in the thread. The people that I need to collaborate over an API design with might like this tool for collaboration. But when it comes to formal record keeping, etc... everyone wants a PDF.
The print layout honestly doesn't feel as well polished as the web layout.