i've been searching for this for a few days now and coming up short. For keynote presentation purposes, i want to mirror my macbook display over airplay to apple tv. Via a support chat i upgraded to Snow Leopard but still no luck. I've found various add on software like airflick etc..but they do video or pdf. I want to mirror the entire display wirelessly like i can from my iphone or ipad. Is this possible? What am i missing? i did not find it listed in features of OSX Lion, i don't want to drop the $$ if its not supported there either. Anyone can point me in the right direction...much appreciated.