Organic field-effect transistors (OFETs) were first described in 1987. Their characteristics have undergone spectacular improvements during the last two or three years. At the same time, several models have been developed to rationalize their operating mode. In this review, we examine the performance of OFETs as revealed by recently published data, mainly in terms of field-effect mobility and on-off current ratio. We compare the various compounds that have been used as the active component, and describe the most prominent fabrication techniques. Finally we analyze the charge transport mechanisms in organic solids, and the resulting models of OFETs.