Kiwix is an offline reader created for reading Wikipedia without internet connection. Kiwix reads the data from some ZIM format files, which are archives of the article contents.

Kiwix is usefull because you can take your laptop with Wikipedia content in all your trips (where you don’t have internet).
It is available in many languages, so that almost everybody can use it.
And trust me, the app is smart. It has a features like case and diacritics insensitive text search engine, bookmarks, pdf or html export and others.
This is where you find the Kiwix package for Linux Operating Systems:
http://sourceforge.net/projects/kiwix/files/0.9_rc2/kiwix-0.9-rc2-src.tar.gz/download
After you have downloaded the kiwix* archive, do this:
$ tar -xzvf kiwix*.tar.gz
$ cd kiwix*
$ ./configure
$ make
$ sudo make install
This is a generical installation from sources, so it works on all the Linux and Unix Systems.
To install Kiwix on Debian Sid, just type: sudo apt-get install kiwix
Kiwix is still not working on Debian Whezzy, only on Debian Sid and Debian Squeeze.
To install Kiwix on Debian Squeeze, do this:
$ sudo su
# echo "deb http://www.squeeziste.com/telechargements/binaires/ ./" >> /etc/apt/sources.list
# apt-get update
# apt-get install kiwix