Basic Printing of content is currently available in Tiki through:

Missing for Book Feature (as far as carsten.aevermann know)

Automatic adding of special pages such as copyright, page index, subject index, book & chapter title pages
Collection of pages (adding to a structure) by drag and drop
Suggestion of related pages (maybe utilizing similar pages?)
Integration of pages from other tikiwiki sites. Maybe some kind of citation footnote have to be generated. See Eclectic Module
Saving of a book/page collection (structures) in MyTiki -> My books
Option to send books/page collections to friends in a way they could modify them
Shopping Cart
Connection to author accounting system (by Poiesipedia/Jörn Ott)
High Quality output (essential!) through (LA)Tex. or Apache FOP. I think wikipedias great looking pdf is generated by tex, but eg. the .odt is generated through xml transformation and doesn't look that good.
Connection to a book on demand store (by region). Maybe using PediaPress.

Nice to have (Long term planning)

As the *book supply chain* field is changing, a method of distribution, such as the ONIX standard is to be considered. See http://editeur.org/ for more information
Multiple predefined print-layouts.
Tool to interactively define layout for printoutput.

Interesting links

Alias