In the CRM 2011 / CRM 2013 form editor you, double-click on a form section to go to it’s properties.  Now, click on the Formatting tab, you can scroll to the bottom and find the setting called “Field Label Position”.  This setting will allow you to move the field labels to the top of the field instead of the default which is on the side.  Saving space this way will allow you to comfortably fit 3-4 columns on a form instead of 2.