Last week OLPC formally announced that the touchscreen-enabled ARM-based model - which we knew was coming after Neonode's announcement in late July - will be called XO-4 Touch: Part laptop, part tablet, the XO-4 Touch will represent a huge leap forward in what OLPC can offer. As its development name, the "XO-4 Touch" suggests, the device will come equipped with an optical multi-touch capable scree