I think first pdaxrom had 2 virtual screens, and now they're at four.
Personally, I use a minimum of 6.
The panel is only on the first screen...
I think it's ctl-alt-arrow to move left and right.
I tend to use screen 1 just to leave it blank or maybe have a small aterm.
screen 2 is firefox, screen 3 is aterm full screen (using screen to im/irc), screen 4 is dillo, screen 5 is aterm full screen (for shell) and screen 6 is xmms.
etc.
Scott
ps: not exactly what you asked, but easy enough. You can move things between windows
with shift-arrow? I do with with my fingers -- so I'm trying to remember what keys I press.