Question: Where can I find a PDF file of the CodeIgniter documentation?
 
Answer: You can find the CI 1.6.1 version of the documentation at:
 
http://www.pixelsandcode.net/downloads
 
NOTE: This PDF is strictly for CI 1.6.1.

UPDATED: The file has been restored, and the link corrected above.

Here is a PDF for CI 1.7.
(The topics are alphabeticaly ordered.)
http://juliendesrosiers.ca/share/CodeIgniter_1_7_manual.pdf

NEW: Alternative PDF manual for CI 1.7
Differences between this and the version above:
- Less pages because it doesn’t have white pages and the context menu is not expanded on every page (252 versus 285)
- PDF bookmarks
http://ameya.ro/files/CodeIgniter_User_Guide_1.7.pdf