Darryl Ayo has a post up about racism in cartooning, the evolution of how racism has affected comics, and aesthetic issues that a history of racist caricatures has created for contemporary black cartoonists drawing black characters today. It assumes the reader knows a bit about comic history, but these are problems that aren't often discussed even though racism in comics is a big issue right now in re: the DC reboot and the introduction of the new Spider-Man.
"In later years, we would see a retreat from such imagery in mainstream comic books, but there was a cost. After some point in history, comic publishers began to feel it not wise or politically inopportune to allow such images in their products. What ended up happening, however, is that black characters largely vanished from many comic books."
That Old Black Magic