Here is one change in the latest Ubuntu release Jaunty (9.04) that is *really* not blind friendly. You can no longer use the Ctrl-Alt-Backspace key combination to restart the graphical (X) session by default. Most of the Orca screen reader users have to resort to using this key combination to start over when Orca screen reader stops or hangs for some unknown reason.
Its not very difficult to turn on this feature back on. To enable this Ctrl-Alt-Backspace key combination you have to use the dontzap program. You might want to install this package on your computer. They type this command in the terminal.
sudo dontzap -d
Reboot the computer and you are ready.
Update In Ubuntu Karmic the dontzap has been removed. You have use the keyboard preference tool.