[arg_discuss] Useful puzzle books?

[Morbus Iff]

Anyone have any suggestions on useful puzzle books to pick up? Most of 
the ones I've fiddled with in the past were physical/manipulative 
puzzles, and not something you'd find, say, on a PXC card or a website.

-- 
Morbus Iff ( earth? shxt and scrambled eggs. earth? )
Technical: http://www.oreillynet.com/pub/au/779
Culture: http://www.disobey.com/ and http://www.gamegrene.com/
aim: akaMorbus / skype: morbusiff / icq: 2927491 / jabber.org: morbus