Suffice it to say that unmonitored in-app purchases by kids have proved problematic -- most of all for the parents who first learn about them through a gigantic bill. The UK's Office of Fair Trading is concerned enough that it's launching an investigation into whether mobile- and web-based games for the junior set are running afoul of consumer protection laws. Its six-month study will explore whether or not those games are "misleading or aggressive" when they goad kids into parting with real cash for virtual goods; the regulator