I dont think it's fair to dismiss OLPC and talk about how this will be better for third world children. Yes this is $25 but you still need to connect it to an input as well as HDMI output. Your Raspberry Pi and monitor needs to be connected to a reliable and constant electricity source where as the OLPC is battery powered with an integrated screen. I know that all these things can be solved but then you have to take into account that the $25 cost will start to increase.