Jens, I've temporarily installed a Linux for testing (Ubuntu 12.04) and followed the steps as described on your page. But how do I actually install codeblocks itself? You describe how to modify the apt sources list and install your keyring files but then the description stops. In the Ubuntu package manager I only see 10/05 version from ubuntu...?! 
Here is how I have done it for a while under Kubuntu (could be bugs since this is from late 2010). Replace "KpackageKit" with whatever the package manager GUI is called now.
I use the repository supported by Jens Lody
http://apt.jenslody.de/ . Using this method, upgrades will automatically be made available for download as the repository is updated. Follow the descriptions on that page, add the following repository in KpackageKit, software sources
deb
http://apt.jenslody.de/ any main
deb-src
http://apt.jenslody.de/ any main
The easiest way to add his public-key to apt's trustdb is to install the package jens-lodydebian-
keyring with your preferred package-manager or with:
$ sudo apt-get update
$ sudo apt-get install jens-lody-debian-keyring
To get the wxWidgets shared libraries used with Code::Blocks, add also to KpackageKit
deb
http://apt.wxwidgets.org/ lenny-wx main
and
wget -q
http://apt.wxwidgets.org/key.asc -O- | sudo apt-key add -
finally, to install Code::Blocks
$ sudo apt-get install wx-common (optional)
$ sudo apt-get install libwxgtk2.8-dev
$ sudo apt-get install codeblocks
Code::Blocks becomes available under Development in the KDE menu.
As noted, there could be inaccuracies in the above, but it illustrates the main approach.
