Recent observations have uncovered large numbers of Lyman break galaxies  (LBGs) and Lyman alpha emitters (LAEs) spanning 3<z<6 .  These populations have surprisingly different evolutionary trends, perhaps indicating that  Lyman-alpha emission is becoming more common in galaxies at earlier times.  The first results emerging from the z>7 universe appear to suggest the opposite trend, with Lyman-alpha emission becoming far less prevalent in star-forming galaxies at z>7.  The sudden change perhaps signals a decrease in Lyman-alpha transmission due to evolution in the IGM ionization state, suggesting that reionization may be incomplete at z~7.  In this talk, I will review the latest results in efforts to locate and characterize the nature of objects at z~7-10 and will discuss recent progress in understanding the processes governing the relative evolution of LAEs and LBGs over z~4 to 8 stemming from large Keck/VLT surveys.