Kristou Says

You can add the key with the following command. Exemple (key=C5E6A5ED249AD24C):
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com C5E6A5ED249AD24C

GStreamer framework (bug fixes)

deb http://ppa.launchpad.net/gstreamer-team/ppa/ubuntu jaunty main

W32codecs:

deb http://packages.medibuntu.org/ jaunty free non-free

Openoffice:

deb http://ppa.launchpad.net/openoffice-pkgs/ppa/ubuntu jaunty main

Network Manager

deb http://ppa.launchpad.net/network-manager/ppa/ubuntu jaunty main

VLC Player

deb http://ppa.launchpad.net/c-korn/ubuntu jaunty main

gCDEmu (a Linux Virtual CD/DVD Drive, like Daemon Tools on Windows)

deb http://ppa.launchpad.net/cdemu/ppa/ubuntu jaunty main

Swfdec & swfdec-mozilla (open-source flash player)

deb http://ppa.launchpad.net/swfdec-team/ppa/ubuntu jaunty main

KDE 4

deb http://ppa.launchpad.net/kubuntu-members-kde4/ubuntu jaunty main

Mono

deb http://ppa.launchpad.net/mono-ubuntu/ppa/ubuntu jaunty main

Wine

deb http://wine.budgetdedicated.com/apt jaunty main

Medibuntu
# Acrobat Reader
# Firmware for the ALSA sound system
# Google Earth
# DVD decryption
# MPlayer / MEncoder
# Non-free codecs and
# Skype

deb http://packages.medibuntu.org/ jaunty free non-free

Opera

deb http://deb.opera.com/opera/ stable non-free

Gnome Do

deb http://ppa.launchpad.net/do-core/ppa/ubuntu jaunty main

GEdit latex plugin is a wonderful plug in to write scientific documents with out the load of fully dedicated IDEs.

This plugin assists you in composing and compiling LaTeX documents and managing BibTeX bibliographies.

It is hosted on SourceForge.net.

I think scrolling using the middle button + TrackPoint was broken for a while, although it is now fixed. to fix it instead of modifying your xorg.conf, create a new file called /etc/hal/fdi/policy/mouse-wheel.fdi with the following contents:

<match key="info.product" string="TPPS/2 IBM TrackPoint">
<merge key="input.x11_options.EmulateWheel" type="string">true</merge>
<merge key="input.x11_options.EmulateWheelButton" type="string">2</merge>
<merge key="input.x11_options.XAxisMapping" type="string">6 7</merge>
<merge key="input.x11_options.YAxisMapping" type="string">4 5</merge>
<merge key="input.x11_options.ZAxisMapping" type="string">4 5</merge>
<merge key="input.x11_options.Emulate3Buttons" type="string">true</merge>
</match>

Then restart your computer.

I have tested this method on my X200 and it looks working fine.
[ad#Ubuntu 9.04]