I've been using WikidPad for a while and have been struggling with it's usability so I had another google around the printing capability of Guidance Explorer (my eventual medium is likely to be some other wiki-like product, so this is likely to just be my 'input medium'). I found the (rather obvious) Guidance Explorer Overview on Codeplex that explains that printing is indirectly supported through the export formats. I tried it and - whoa!! I take it all back.
The export to Word format at different levels and different views is just great. It gives you an index at the top with links to the actual content. The formatting's nice too. The HTML format's just the same as the Word doc visually, but spits out the content to separate files which is a bit nicer for deployment.
I still can't believe how little-known Guidance Explorer is, but much of the Patterns and Practices work is documented, along with many other resources. I'll certainly be saying Bye bye to WikidPad.