New software, new features, new bugs.
Here are some of my problems, and some workarounds. More will follow. Maybe.
You might also want to have a look at the Ubuntu 8.04 Release Notes
I was surprised this time. No major problems with my X800 XL graphics card using fglrx. I just did
sudo dpkg-reconfigure -phigh xserver-xorg xrandr --output DVI-0 --auto --right-of VGA-0
and Dual Head was working again. Sometimes even the Screen Resolution tool lets me configure dual head properly.
The Tilda crash bug is fixed now. But there is another one: It looses focus after opening. There are two workarounds for this:
You may also want to have a look at this: Hotkey to switch Keyboard Layout. There is at least one bug that prevents you from switching the keyboard layout. If this happens, here is how to get it working again: Just delete the second keyboard layout in the Keyboard Preferences dialog and add it again.