Run out of bars? Need more spots?
Well some people may not know this - you can get 2 extra bars - go into your settings, interface settings, HUD and tick the boxes for the 2 extra bars.
Oh wait, they're not that big...
Well you can expand them, simply hover over the bar, find the bottom drag it down. You can make it as long as your screen.
Simply right click on the action bar, and voila, you got a horizontal action bar, do the above to make it longer.
You have 2 of these, use them wisely.