"This guide was first meant to be my own reference, but I think it can be useful to anyone wanting to get the best of his Ubuntu box.
Summary
A. Media codecs, DVD support and more
B. Use the Gnome Control Center
C. Set up Firefox & Thunderbird
D. Install useful software
E. System & administration software
F. How to install fonts
G. Get more languages
H. How to force the package architecture
I. How to install Virtualbox
J. External monitor with NVidia
K. Hardware specific issues
L. Tips & tricks
M. Miscellaneous
N. Ubuntu branding
Final thoughts & comments"