Latest Nvidia & AMD Drivers

Envy makes it easy to install and update the latest Nvidia & AMD drivers.

Compiz

Here is a good article on getting Compiz working under Ubuntu. Note that Ubuntu Hardy includes Compiz, you simply need to enable it and get the Emerald window manager (plus some nice themes).

Monitor Resolution

If you are having problems with the resolution of your monitor under X check out this page for some useful tips. If you need to reconfigure the display you can run displayconfig-gtk, while to change the resolution of your boot screen edit /etc/usplash.conf then run update-initramfs -u. Some other good tips can be found here.

Solutions for 9 bugs in Ubuntu 8.04

You can find help to to a number of common problems in Ubuntu Hardy at the Solutions for 9 bugs in Ubuntu 8.04 page.

Fonts!

Get the nice aenigma free fonts from here (source).

Some 'fun' fonts are available from here (source).