I use the 3m Mini hooks in our living room and none of them have fallen yet. http://www.amazon.com/Command-TM-Adh...5245312&sr=8-1
They are supposed to come off clean as well. You should be able to find them at WalMart/Kmart where ever pretty cheap.
One note, you're supposed to put them up and let sit for like 20 minutes before hanging anything from them. They work great though.