Displaylink for ipad is currently free. it allows your ipad to act as your 2nd screen for those extra screen space that you need. I paid 1.19 for this before.
THE PREMIER MULTI-MONITOR APP FOR WINDOWS USERS
**** FREE FOR A LIMITED TIME ****
**** TO CELEBRATE THE BRITISH ROYAL WEDDING ****
NOTE: NO MAC OS SUPPORT IN THIS VERSION. IT IS WINDOWS ONLYhttp://www.displaylink.com/support/downloads_ipad.php