Get the iRest from Rain Design.
http://www.raindesigninc.com/irest.html
I've seen some iPad holders that float the iPad over your head on a long arm. Fun but too pricey.
The iRest works well. The large foam cushions are easy on your body. The stand lifts the iPad up so that it is easy to see when you lie down. The stand by itself doesn't always tilt the iPad forward enough, but it is easy to hold the iPad on the stand and tilt it forward.