During the last years we witnessed an improvement of organic electronic devices and emergence of new devices, as a homogenous PN junction. At the same time the theory of charge transport in organic semiconductors was reexamined, with an emphasis on application to devices realistic operation condition. In this talk I will review the recent experimental evidences and advances in theory of charge transport in amorphous organic semiconductors. I will demonstrate that taking into account non-linear effects and a reasonable shape density of states the electronic behavior different devices (PN homogenous diode, PV cell and FET) that operate at different conditions can be explained by a single theoretical model. The differences between the major theoretical approaches will be briefly discussed as well.