Is there any way to create a 2-dimensional virtual desktop space in Ubuntu? The only control I'm seeing is the number of virtual desktops, but they seem to only go in a line. I'm used to having a 2-dimensional space (so I can go up/down/left/right instead of just left/right), and I'd really like to have that in ubuntu as well.
If you're using the default Gnome configuration in Ubuntu, you should have a "workspace switcher" panel applet in the bottom panel, on the right. Right click, and select Preferences. That will pull up a small dialog with Columns and Rows.
The total number of workspaces is Columns times Rows. For example,
There are several other places you can set this, including in the CompizConfig Settings Manager (under General Options, on the Desktop Size tab).
If you add multiple rows, you may want to increase the size of the bottom panel (right-click > Preferences) so the Workspace Switcher applet is decently usable. (I found 36 pixels a reasonable size for 2 rows.)