Tammy's Tip No. 116 - Airplay without AppleTV
You've got an iPad, and you've got a laptop connected to a projector, but no iPad adapter, or even an AppleTV. What to do!
"Now there are two great and inexpensive (less than $15) options for doing a wireless display from the iPad (or an iPhone 4S or 5) to a projector. Actually, you will need to display to a computer that is connected to a projector, but you probably already have that setup...."
Visit Tammy's site to find out more about "Reflection" and "Airserver".