I installed the fglrx driver, using the graphical installer, pressing next next.. (not too hard :P)
I then issued this aticonfig command
aticonfig --initial=dual-head --screen-layout=above
aticonfig --dtop=horizontal --overlay-on=1
to get my dual monitors working. a new /etc/X11/xorg.conf gets written and it is all happy. I reboot, (i have a problem where i get a blank screen on Ctrl+alt+f1-f6), and it reboots happily and fglrinfo shows :